106 AMERICAN MARINE CONCHOLOGY. 
The ova are deposited in the latter part of August. They are | 
minute, white, and enveloped in a gelatinous mass, which is glo- 
bular, hyaline, and somewhat larger than the animal. 
Massachusetts. 
2. P. QUADRATA, Searles-Wood. Fig. 218. 
Mag. Nat. Hist. n. ser., iii. 461, t. 7, f. 1. 1839. 
Philine formosa, Stimpson, Bost. Proc., iii. 384. 1850. 
Shell minute, squarely globose, subtruncated anteriorly, white, 
shining, subopaque, thickened posteriorly, punctured with inequi- 
distant, sometimes undulated, revolving striz ; apex deeply exca- 
vated, columella sinuose, broadly and lightly callous ; lip crenu- 
lated posteriorly ; aperture very wide. 
Length 4.5, diam. 3.5 mill. 
New England, northwards. (Zetlands.) 
8. P. LINEOLATA, Couthouy. Fig. 219. 
(Bulla.) Bost. Journ. Nat. Hist., iii. 179, t. 3, f. 15. 1882. 
Shell very small, oblong-ovate, broadest at the base, thin and 
fragile; whorls three; the last inflated and enveloping all the 
others, with numerous impressed minute revolving striw; spire 
small, prominent, flattened, with the outer lip arising from near 
its summit; aperture the whole length of the shell, narrow above, 
dilated beneath, somewhat effuse at the base; a faint oblique fold 
near the middle of the columella; pale-brown, with a thin ferru- 
ginous epidermis; within glossy yellowish-white. 
Length 3.75 mill., diam. 2 mill. 
Massachusetts, northwards. 
According to Mr. Gwyn Jeffreys this species = lima, Brown, 
1827. 
Section B. NUDIBRANCHIATA. 
Gills exposed or contractile into cavities on the surface of the 
mantle; adult animal without any shell; larva shell-bearing ; foot 
elongate, formed for walking; sexes ehie 
* Gills plumose, on the hinder part of the mantle, disposed tn a ctrele or 
semicircle, round the vent. Anthobranchiata. 
Family Dorip1p%. Mantle-edge simple; gills surrounding the 
vent, on the middle of the hinder part of the back, in a common 
cavity. 
The gills are retractile into a common cavity, and the mantle is 
very large, either entirely or almost covering and concealing the 
foot. 
