116 AMERICAN MARINE CONCHOLOGY. 



Genus TERGIPES, Cuvier. 

 Ann. du Mus., xix. 1813. 



1. T. despecta, Johnston. Fig. 240. 



(Eolis.) Mag. Nat. Hist., viii. 378, f. 35e. 



Animal colorless, with a zigzag olive stripe along the hack; 



branchiae large, ovate, in a single series along each side; dorsal 



tentacles long; angles of foot not produced. 



Length 6, breadth 1.25 mill. 



Massachusetts; Scotland. 



2. T. gymnota, Couthouy. Fig. 241. 



(Eolis.) Bost. Journ. Nat. Hist., ii. 09, t. 1, f. 3. 1838. 



Animal small, tapering to a fine point, watery white; tentacles 



short, the posterior pair minutely seriated ; branchiae in seven 



lateral clusters of about five each, slightly club-shaped, having a 



reddish-brown centre. 



Length 25, diam. 2.5 mill. 



Massachusetts. 



Genus CALLIOPJEA, Orb. 

 Mag. Zool., t. 108. 1837. 



1. C. fuscata, Gould. Fig. 241a. 



Invert. Mass., edit. ii. 250, t. 1G, f. 218-221. 1870. 

 Animal semieylindrieal, attenuated behind, dark slate-colored ; 

 head not distinct, excavated in front ; tentacles two, long, pointed; 

 branchiae long, club-shaped, slender at base, alternating in two 

 parallel rows on the two posterior thirds of each side, the lower 

 series much the smaller; foot bilobed in front, contracted poste- 

 riorly. 



Length 7.5, diam. .8 mill. 



Massachusetts. 



Family HERM^EID.E. 

 Synopsis of Genera. 

 Tentacles two, longitudinally folded ; head without lobes ; gills elongate, 

 papillose, smooth, arranged along the sides of the back. 



IIerm^ea, Loven. 

 Head without tentacles, produced into a lobe on each side ; gills papillose, 

 arranged in transverse rows on the sides of the back. 



Alderia, Allman. 

 Tentacles two, simple, undefended, contractile, sublateral ; a large labial 

 veil, produced on each side into an oblong, flat lobe ; gills simple, papil- 

 lose, lateral, in a simple series on each side of the back ; foot rather 

 broad. Clcelia, Loven. 



