MARINE MOLLUSCA OF THE UNITED STATES. 113 
1. D. cononata, Gmelin. Fig. 231. 
(Doris.) Syst. Nat. i. 3105. 1790. 
Melibea coronata, Johnston, Ann. Nat. Hist., i. 117, t. 8, f. 5-8. 
Animal yellowish, dotted with red; veil square in front; 
. branchiz five to seven on each side, ovate club-shaped, bearing 
several circles of papillse with dark red tips. 
Length half an inch. 
New England. (Hur.) 
Family HOLIDIDA. 
Synopsis of Genera. 
Body broad; tentacles four, smooth, elongate, subulate; labial feelers 
elongate ; gills papillose, arranged in longitudinal rows, not clustered, 
numerous, depressed, and imbricated. Hours, Cuvier. 
Tentacles subulate, annulate, or perfoliate; labial feelers subulate ; gills 
clustered, or arranged in separate tufts along the back. 
FLABELLINA, Cuvier. 
Body linear: tentacles subulate, smooth, simple; labial feelers short; gills 
in a single row on each side ; foot squareinfront. TERGrPxEs, Cuvier. 
Head without tentacles ; lahial feelers very long and tapering; gills pyri- 
form, placed in longitudinal lines; front of foot angular. 
Cauuiopaa, D’Orbigny. 
Genus AOLIS, Cuvier. 
Tabl. Elem. 1798. 
1, A. papittosa, Linneus. Fig. 232. 
(Limaz.) Syst. Nat., edit. xii. 1082. 1767. 
EHolis farinacea, Fould, Stimpson, Invert. Grand Manan, 25. 1853.! 
Animal ovate-oblong, depressed, dusky or orange-colored, dotted 
with brown, ochreous, or white; branchiz numerous, somewhat 
compressed, crowded and imbricated, eighteen to twenty-four 
oblique ranges; dorsal tentacles short, smooth, conical, labial 
tentacles short and simple; angles of foot slightly prolonged. 
Length two to three inches, breadth one-third the length. 
New England; Northern Europe. 
2. Al. SALMONACEA, Couthouy. Fig. 233. 
(Holis.) Bost. Journ. Nat. Hist., ii. 68, t. 1, f 2. 1888. 
Eolis Bodoensis, Moll. Moll. Groen. 1842. 
Body nearly diaphanous ; back with a conspicuous elevation in 
the middle ; head large, with four tentacula; the superior minutely 
1 There are about a dozen additional synonymic names by British authors. 
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