REPORT ON THE T.AM KLTJBRANCH [ATA. 249 



Leugtli 21 luni., height If^, <li;iiiR'tcr I. 



Habitat. — Station 24, off Culebra Ishiiid, West Indies, in 390 fathoms; Pteropod ooze. 



This species is very like Gloimis nitcus in some respects, l)iit is well distinguished 

 by the shallow depression down tlic jiosteiior side, wliidi causes the margin at that fiart 

 to be somewhat truncate or even faiuth' incurved. 



Glomus simplex, n. sp. (PL XXI. figs. •l—lb). 



Testa ovato-circularis, fere ajcpiilateralis, tenuis, paulo convexa, albida, sulipellu(;ida, 

 nitida, inerementi liueis tenuibus striata. Umbones parvi, le^ater supra marginem 

 produeti. Linea cardiuis angusta, dentibus anticis ad novem posticisque circiter 

 quindecim instructa. 



Length 4|, mm., height '?,\, diameter 2. 



Habitat. — Station 24, off Culebra Island, West Indies, in 390 fathoms; Pteropod ooze. 



This species in texture, sculpture, and the hinge-characters closely resembles GIodi u.'i 



nitens, l»ut is distinguisha1>le by its different form, being more ovate or longer in 



proportion to its height. 



« 



Glomus incBquilatendis, n. sp. (PI. XXI. figs. 3-36). 



Testa minuta, olituse ovata, mediocriter convexa, tenuis, insequihiteralis, albida, 

 inerementi lineis tenuibus sculpta. Mai-go dorsi anticus brevis, declivis, rectiusculus aut 

 vix arcuatus, posticus longior, minus obliquus, leviter excurvatus. Umbones parvi, 

 antemediani, paulo prominentes. Linea cardinis mediocriter valida, dentibus anterioribus 

 octo posticisque ad decern munita. Pagina interna nitida, cicatrice antica rotundata et 

 postica majori longiori, impressa. Pallii impressio simjjlex, hand sinuata. 



Length 2j mm., height if, diameter 1. 



Habitat. — Station 24, off Culebra Island, West Indies, in 390 fathoms; Pteropod ooze. 



This species is c[uite distinct in form from any of the other -species, being decideiU)' 

 less equilateral. Its teeth also are rather stronger, the ligament less oblique, and the 

 muscular impre.ssions more distinct. Whether this and the other forms exceed their 

 known dimensions, it is imjDossible to say, l)ut in all })robability they do to some extent. 



Glomus sp. 



Habitat. — Station 24, off Culebra Island, West Indies, in 390 fathoms; Pteropod ooze. 



As only a single minute valve of this species was obtained, which is evidently 

 distinct from any of those here described, I refrain from naming it at present. It is 



(ZOOL. CHALL. EXP. — PART X.KXV. — 1885.) Mm 32 



