672 Ericthonius 



of 5*^, bind margin slightly concave in the middle; finger very large, falciform; 

 but both 6^^ Joint and finger variable in size and shape. Gnathopod 2 in 9, 

 6^'^ Joint produced along bind margin of 6**^ in a narrow lobe distally armed 

 with setae and recurved spines, 6^^ Joint large, palm rather oblique, longer 

 than bind margin, finger matcbing. Peraeopods 1 and 2, 2^ Joint broadly 

 oval, finger smootb. Peraeopods 3 — 5 successively longer; 2^ Joint successively 

 narrower in proportion to lengtb, oblong (Dana: nearly orbicular in peraeopod 3, 

 narrow in peraeopod 5); in all finger witb denticle on hinder convex margin. 

 Pleopods 1 — 3 normal, witb coupling spines and cleft spines. üropods 1 

 and- 2, peduncle longer tban rami, margins raore or less pectinate, spines 

 small exeept tbe apical; in uropod 2 tbe rami laminar, üropod 3, peduncle 

 broad at base, much longer tban tbe ramus, wbicb ends in 2 upturned 

 spines. Telson twice as broad as long, triangularly pointed between 2 rounded 

 lobes, densely spinulose on tbe surfaee. Colour brownisb or orange, witb 

 dots. L. 4 — 12 mm. 



Occupies tubes affixed to hydroids and algae. 



Atlantic with adjoining seas (Europe from South- and West-Norway (depth 

 19 — 75 m) to Adriatic and ?Bosphorus; Kio Janeiro; Vineyard Sound); North-Pacific 

 (San Fraucisco, depth 4 m). 



2. E. pugnax (Dana) 1852 Erichthonius p., Pyctilus p., J. D. Dana in: P. Amer. 

 Ac, V.2 p. 218 I 1853 & 55 P.p., J.D.Dana in: ü. S. expl. Exp., vASu p. 975; t. 67 

 f. 4a— d i 1862 Cerapus p., Bäte, Cat. Amphip. Brit. Mus., p. 267 t. 45 f. 7 | 1893 Erich- 

 thonius difformis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 381. 



Closely related to E. brasiliensis (p. 671), but tbe 6*^ Joint of gnatbo- 

 pod 2 in d sparingly erose witbin, bind margin (in figure) composed of 3 

 smootbly rounded tubercles; peraeopod 3 is said to bave tbe 2"^ Joint of tbe 

 same form as in E. macrodactylus, witb a narrow acute Prolongation of tbe 

 bind margin. L. ? 



Sooloo Sea. 



3. E. macrodactylus (Dana) 1852 Erichthonius m., Pyctilus m., J. D. Dana 

 in: P. Amer. Ac, v.2 p. 218 | 1853 & 55 P. m., J. D. Dana in: U. S. expl. Exp., r. 13ii 

 p. 974; t. 67 f. 3 a— c j 1862 Öerapus m , Bäte, Cat. Amphip. Brit. Mus., p. 266 t. 45 f. 6 | 

 1893 Erichthonius difformis Qmrt.), A. Della Valle in: F. Fl. NeapeJ, r. 20 p. 381. 



Distinguisbed from E. difformis especially by tbe long tootb of tbe 

 5*^ Joint in gnatbopod 2 being separated from the base of tbe ü^^ Joint 

 by a very deep cavity, and by tbe 2*^ Joint of peraeopod 3 baving a narrow 

 acute Prolongation of tbe bind margin. Side-plate 5 smaller tban eitber 

 tbe 4*^ or 6*^^ (in figure, but?). L.? 



Sooloo Sea. 



4. E. difformis M.-E. 1830 E. d., H. Milne Edwards in: Ann. Sei. nat., t'. 20 

 p. 382 ! 1888 E.d., T. Stebbing in: Rep. Voy. Challenger, t;. 29 p. 595 | 1859 Erich- 

 tonius d., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. 1 p. 17 j 1879 Cerapus d., 

 Hoek in: Tijdschr. Nederl. dierk. Ver., v.i p. 119 t. 5 f. 14, 15; t. 6 f. 3; t. 8 f. 11, 12 | 

 1889 C. d., Hoek in: Tijdschr. Nederl. dierk. Ver., ser. 2 v.2 p. 229 t. 10 f. 15 | 1894 

 Erichthonius d., G. 0. Sars, Crust. Norway, v. 1 p. 604 t. 216 f. 1 | 1842 Podocerus 

 leachii, Kreyer in: Naturh. Tidsskr., v.A p. 163 ] 1853 Cerapus whitei, Gosse, Rambles 

 Devonsh., p. 382 | 1857 Podocerus imnctatus, Bäte in: Ann. nat. Hist., ser. 2 v. 19 p. 148 j 

 1862 Cerapus difformis -\- Dercothoe p., C. p., Bäte & Westwood, Brit. sess. Crust., v. 1 



