116 AMERICAN MARINE CONCHOLOGY. 



Genus TERGIPES, Cuvier. 

 Ann. du Mus., xix. 1812. * 



1. T. DESPECTA, Johnston. Fig. 240. 



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



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

 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. 69, t. 1, f. 3. 1838. 



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

 short, the posterior pair minutely serrated ; 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. Zooi:, t. 108. 1837. 



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



Invert. Mass., edit. ii. 250, t. 16, f. 218-221. 1870. 



Animal semic} T lindrical, 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. 



HERM^A, Loven. 



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

 arranged in transverse rows on the sides of the back. 



ALDEEIA, 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. 



