118 DR JAMES COSMO MELVILL AND MR ROBERT STANDEN ON THE 



Order PEOSOBRANCHIATA. 

 Sub-order DIOTOCARDIA. 



Section Zygobranchiata. 



Family Fissurellidss. 



Emarginulidse. 

 Puncturella noachina (L.). 



Patella noachina, Linnaeus, Mantissa, p. 551. 



Puncturella noavhina, Lowe, Zool. Journ., iii. p. 78 (1827). 



Gemoria princeps, Migliels, Proe. Boston Soc. Nat. Hist. (1841), p. 49. 



Rimula galeata, Gould, U.S. Explor. Exped., p. 369, t. xxxi. figs. 476, 477. 



Hob. Trawl, Burdwood Bank, Station 346, south of the Falkland Islands, lat. 

 54 25' S., long. 57 32' W., December 1, 1903. 



Bleached but perfect specimens of a British and North European species, also 

 known to extend to the Falkland Islands and Straits of Magellan. It is likewise 

 recorded by Dr HERMANN STREBEL,* from Berkeley Sound, lat. 51 53' S., long. 58 W. 



We include under the name noachina (L.) various forms, e.g. conica, D'Orb.. 

 falklandiana, A. Ad., cognata, Gould, and galeata, Gould. It is most probable that 

 the gatherings from Burdwood Bank would come under the name mentioned second, 

 falklandiana. 



Family Pleurotomariidse. 

 Scissurella eucliarista, sp. n. (Plate, figs. 1, In). 



S. testa perminuta, globulosa, delicatissima, alba, naticoide, paullum elevata, anfractibus 4, quorum 

 apicalis fere 1 immersus, penultimo inHato, tunaescente, ultimo epidermide evanida pallide straminea contei'ta, 

 infra sutnram leniter planato, deinde bicarinato, quarum inter fines scissura extensa, angusta, caetera super- 

 fioie delicate sub lente spiraliter teuuissime striata usque ad basim supra carinam radiatira leniter plicata, 

 umbilico fere clauso, apertura rotunda, labro rotundo, tenuissimo. 



Alt. 1, diam. -75 mm. 



Hob. Burdwood Bank, 56 fathoms, trawled. Station 346. 



A perfect example of one of the smallest shells possible, and yet full of character. 

 We have compared it with the majority of the genus, and find it stands out con- 

 spicuously in general roundness of outline, the double carination, within which, towards 

 the aperture, is situate the narrow extended slit, not causing, us is usual, an angular 

 appearance. Indeed, in form it is almost naticoid. Below the carinae, the surface to 

 the base is transversely very finely striate, the umbilicus appears partly covered, the 

 outer lip is round and extremely thin. Somewhat of the same form as Sc. conica, D'Orb., 

 also from Southern waters ; but in our species the slit is situate much nearer the suture, 

 that of conica being almost median, (ev-^dpia-roy, elegant, agreeable.) 



* Schwed. Sudpolar Exped. (1908), p. 79. 

 (ROY. soc. EDIN. TRANS., VOL. XLVIII., 344.) 



