POLYCERID 2. aut 
Issa, Bergh. 
Syn.—Colga, Bergh. 
Example.—lI, lacera, Bergh. 
Frontal and dorsal appendages less developed than in Triopa, 
mouth with triangular jaw. Lingual armature consisting of a 
median row of plates, two strong lateral and seven external 
plates. 
HeEreroporis, Verrill and Emerton, 1882. 
Distr.—H. robusta, V.and E. Martha’s Vineyard, Mass. 
Form and general appearance like Triopa and Triopella, but 
stouter and without any trace of gills; mantle forming an 
edge all around the back; surface of the back with scattered 
papilla; a longitudinal crest between and behind the dorsal 
tentacles, which are lamellose and retractile, without sheaths, but 
with a prominent fold of the mantle-margin in front of them; 
head large, rounded, with a free, thin margin, which has a flat 
tentacular lobe on each side; foot broad, rounded in front; a 
large opening, apparently the anus, on the right side between 
the mantle and the foot, behind the middle ; verge, as protruded, 
stout, cylindrical, swollen and rounded at the end, not armed ; 
a short, stout, conical papilla just behind its base, and a lobe 
below it; farther back, nearer the anal (?) opening, there is a 
small, simple opening, probably urinal. Odontophore broad, 
with very numerous small, strongly hooked acute teeth in each 
row, all similar except a few near the centre, which are less 
curved and not so acute; no median tooth. 
THECACERA, Flem., 1838. 
Distr—3 sp. W.Coast of Eur. TZ. pinnigera, Mont. (xc, 4). 
Body limaciform, smooth; mantle obsolete; supracapital veil 
indistinct ; rhinophores laminated ; no oral tentacles; branchiz 
non-retractile, with linear or tubercular lateral appendages. 
Odontophore broad, with 12-14 plates ; the two inner on each 
side bearing bicuspid spines; no central plate. Small lateral 
corneous jaws. 
Crimora, Ald. and Hanc., 1862. 
Distr.—C. papillata, A.and H. Guernsey. 
Body limaciform. Mantle nearly obsolete, forming a supra- 
capital veil with branched appendages, and a papillated ridge 
along each side of the back. Rhinophores laminated. Oral 
tentacles tubercular. Branchiz non-retractile, placed about two- 
thirds down the centre of the back. Tail short, without a dorsal 
carina. Odontophore broad, bearing 26 or 27 spines on each 
side, of three kinds: the inner one is large, hooked, and 
bieuspid ; the next 5 or 6 are short and obtuse, and supported 
on quadrilateral plates; the rest very long, slender, and minutely 
denticulated on the inner margin. No central spine. 
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