56 MolL 
MOLLUSCA. 
Gulf of Mexico, 805 fath., and var. n. nitens (Jeffreys, MS.) ; Dali, 1. c. 
pp. 102 & 44. 
Seguenzia delicatula, sp. n., id. 1. c. p, 48, Gulf of Mexico, 805 fath. 
Callogaza, g. n. Resembling Gaza (Watson), but the umbilical pad 
reflected only partly over the umbilicus, pillar straight, passing without 
notch or mucro into the basal margin. C, superha and watsoni, spp. nn., 
Caribbean Sea, 303 & 177 fath. ; id. 1. c. pp. 50 & 51. 
Microgaza, subg. n. of the preceding. Shell flattened, rotelliform, with- 
out reflected lip or umbilical callus, umbilicus distinctly scalariform ; 
brilliantly nacreous when fresh. M. rotella, sp. n., Barbados, 100 fath., 
id. ibid. 
Adeorbis fimbriatus, sp. n., Martens, SB. nat. Fr. 1881, p. 65, New 
Guinea, 400 fath. 
HALTOTIDIDiE. 
Pleurotomaria (Sow,). A distinct family, Pleurotomari[i]d(^f proposed 
for it ; operculum horny, subspiral or multispiral ; two gills nearly symme- 
trical ; edge of the mantle papillose ; lateral fringes present, but no 
elongated cirri like those of Trochus ; no frontal veil, muzzle simple ; 
eyes on pedicels exterior to the base of the simple tentacles ; rhachidian 
tooth lanceolate or bayonet-shaped, laterals rather simple, numerous, 
similar, diminishing in size outwardly, followed by a large number of long 
slender uncini, many of which are denticulate near their tips, and also 
furnished with a little tuft of bristles. P. quoyana (Fischer), 73 & 
84 fath., P. adansoniana (Crosse), 94 & 200 fath., all near Barbados. Dali, 
Bull. Mus. 0. Z. ix. pp. 77 & 78. 
Haliotis (Padollus) pourtalesi, sp. n., id. 1. c. p. 79, near the Florida 
reefs, 200 faths. 
FiSSORELLIDJ]. 
Puncturella (Lowe, 1827). Historical note on the generic name, 
Cemoria (Leach), which was duly published only in 1852. P. circularis 
and trifolium, spp. nn., Yucatan Strait, 529 & 640 fath., Dali, 1. c. p. 74-76. 
Subemarginula gigas, sp. n., E. v. Martens, Conchol. MT. ii. p. 103, 
pi. xix., Northern Japan. 
ParmopJiorus unguis (L.). Description of living animal, habits noc- 
turnal; Hutton, Tr. N. Z. Inst. xiii. p. 203. 
GYGLOBBANOEIA. 
Acm^idjj. 
Acmcea pelta (Esch.). H. Hemphill, having examined about 400 
specimens, comes to the conclusion that if this species fixes itself on 
weed (Phyllospora menziesi) it assumes the aspect of Nacella, and if it 
remains there becomes, when adult, indistinguishable from N. instabilis 
(Gould), whereas it assumes its normal form and gay coloration if fixed 
on rocks; P. Ac. Philad. 1881, pp. 87 & 78. [A somewhat similar instance 
