932 



SCANDINAVIAN KISIIKS. 



Sheppy Argmtiite, Pexn., Brit. Zool. (ed. Warr. ITTfi). vol. 



Ill, p. 280, tab. LXV, Xo. 15G. 

 .Salmo Miilleri, Gmel., Stjst. Nat. Lin., ed. XIII, lorn. I, ji. 



1378; Kr. (Maiiroliciis), Danm. Fid-., vol. 111. p. 113. 

 Argentina Pennant}, Walb., Ichthgol. Art., pt. Ill (Gen. Pise), 



p. 47; Cuv., Val. (•Scopeliis), Hist. Nat. Poiss., vol. XXII, 



p. 431; ; Yai'.r. (Richards.), Brit. Fish., ed. 3, vol. I, p. 



330; Dav (Manroliciis), Fish. Gt. Brit., Irel., vol. II, p. 411, 



tab. CIX, Bg. 2; CoLi,., N. Mug. Naturv. Chrnia, Bd. 29, p. 



104; Petersen, Vid. Meddel. Natiirli. For. Kbhvn 1884 (188r)), 



p. 158; LiLLi., Sv., Nory. Fmi, Fisk., vol. III. p. 10. 

 Scopelus borealis, NiLSS., Prodr. Ichthi/ol. Scand., p. 20; Id., 



Observ. Iihthyol., p. 9; Id., ^kand. Fna, Fisk., p. 479; 



Gthr (Maitrolictis), Cat. Brit. Mus., Fish., vol. V, p. 389; 



Coll., Forh. Vid. Selsk. Chrnia 1874, Tillsegsh., p. 150; 



1879, No. 1, p. 84; Malm, Giigs, Boh. Fna, p. 533; Winth., 



Naturh. Tidskr. Kbhvn, ser. 3, vol. XII. p. 42; Storm, Vid. 



Selsk. Skr. Trondhj. 1883, p. .'SO; .Tord., Gilb., Bull. U. S. 



Nat. Mus., No. 16, p. 284. 

 Scopelus Humboldtii, Yarr., Brit. Fish., ed. 1, vol. II, p. 04; 



ed. 2, vol. II. p. 161 (uec Klsso, nee Olivier); Storer, 



MeiM. Amer. Acad. Arts. Sc, n. ser., vol. II, p. 450; vol. 



VI, p. 328, tab. XXV, fig. 5. 



Forma niediterranea (an species ilistinctaV). ma.xillis et niandibiila 



longioribus: 

 Maurolicus amethystino-jninctatns, Cocco. 1. c.; Gthr, 1. c, 



p. 390. 

 Maurolicus australis, Hector, Trans.. Vmc. N. Zeal. Inst., vol. 



VII, p. 250, tab. XI, fig. 90. I), vide GUxther, Ann. Mag. 

 Nat. Hist., ser. 4, vol. XVII (1876), p. 399. 



Obs. In 1766 Strom found on the shore, at Wolden parson- 

 age in Siindmor, a specimen of this species (see his MS, quoted by 

 Collett), a drawing and description of which he sent "more than 

 20 years before 1791" (see Skr. Naturh. Selsk., Bd. 2, H. 2, p. 15) 

 to 0. F. MtJLLER, who appends to his above-mentioned diagnosis, 

 "Cl. Str6m misit." Afterwards Str6m confused this species with 

 Mijctophum glnciule, which he distinctly figured and described in 

 Skr. Naturh. Selsk. (1. c.) — a circumstance first pointed out by 

 NiLSSON in his Skand. Fna. But this cannot affect the determination 

 of Salmo Miilleri in Gmeux, who merely copied Mt'LLER. 



The Pearl-side belongs to the small fishes. Our 

 largest specimen from Bohusliln indeed measures 72 

 mm. from tlie tip of the lower }xw to the extreme end 

 of the caudal fin; but the distance from the tip of the 

 snout to the end of tlie middle caudal rays, tiie mea- 

 surement termed in the ])rcsent wurk tiic length of the 

 body, is not quite 68 mm. 



The 1)1 )dy is moderately elongated, with terete 

 bai'k and Ijclly, fiattencd, vertical and parallel sides. 

 In the forepart of the bod>", in front of the dorsal and 

 ventral fins, the ventral contour is percej)tibly more 

 curved than the dorsal; but in the hind part of the 

 body these contours are straighter and converge with 



fair uniforinitv towards tlie base of the caudal fin. 

 The greatest depth of the body, which occurs at about 

 the middle of the preabdominal part, is about ' . (18 

 — 21V, %) of the length of the same"; and the least 

 depth (jf the tail is about ' ., of the sai<l dcjjth or ' jj 

 — '/,,; (about 6 '2 %) of the length .if the body''. The 

 greatest thickness, whicli is fairly uniform througliout 

 the forepart of the trunk (the preabdominal region), 

 measures about 8 — 10 % of the length of the body. 



The outlines of the iiead run in uninterrupted 

 continuation of those of the body, its sides being also 

 flat and parallel; but the lower jaw, which sharply 

 ascends Mdien the mouth is closed, renders the inferior 

 contour of the head more curved, while the superior 

 contour is straighter. The forehead is also grooved 

 longitudinally, its edges rising in a ridge that runs 

 along each side, and e.Ktends forward above the margin 

 of the eye, at the anterior upper angle of which it 

 divides to enclose the nasal cavity; but the middle of 

 the forehead is coursed by a lower longitudinal ridge. 

 The length of the head is about ' ; (26— 22' . %) of 

 that of the body. The eyes are round, though their 

 longitudinal diameter is somewhat greater than the 

 vertical, and measures about 88 — 35 %'' of the length 

 of the head. They are set high, their upper margin 

 lying almost in the plane of the forehead, and are only 

 verj- .slighth' and obliquely upturned. The least inter- 

 orbital width is about '/r, of their longitudinal diameter, 

 which is equal to the postorbital length of the head. 

 The nostrils are set close together, each pair at the 

 extreme front of the triangular nasal cavity, above the 

 dark to]) of the preorbital bone and liehind the arti- 

 cular knoi) — also dark-coloured — of the maxillary. 

 The anterior nostril on each side is round, the posterior 

 an obli(piely-set, transverse slit. The suborbital ring, 

 which forms the silvery cheek, is thin but complete 

 along the lower half of the orbit, in front of unifonu 

 breadth, only slightly broader at the penultimate sub- 

 orbital bone, the hindmost suborbital bone, on the 

 other hand, being small and triangular. Tlie tip ot 

 the snout is sharp (shallo\\) but truncate, with a slight 

 indentation at the middle. The length of the slender 

 interinaxillaries is equal to the vertical diameter of the 

 ejes. The maxilhiries are formed as in the preceding 



20—23 'i of the length of the body excluding the caudal fin. 



About 7 "o (according to Lilljeboro nearer 8 ?») of the length of tlie body excluding the caudal fin. 



According to Liljeborg 32 % of the length of the head from the tip of the lower jaw. 



