18 LIMACHLE. 



mal have been found excepting as to its locality. The 

 characters, however, are sufficiently marked to distinguish 

 the species. From its slight reticulation, in its contracted 

 state, it must have been quite smooth when extended. 

 Its colors are similar to those of Tebennophorus Carolin- 

 iensis, and similarly distributed. The lower tentacles are 

 not very conspicuously spurred, but the puncture for the 

 protrusion of a spur is manifest. 



As the anatomical details have been fully given in the 

 first part, this animal, the only one of the genus yet 

 found in the United States, will not be without interest. 



GENUS TEBENNOPHORUS, BINNEY. 



GENERIC CHARACTERS. 



ANIMAL. Body somewhat flattened, terminating ob- 

 tusely, or in a somewhat truncated form. Back con- 

 vex, more flat when fully extended. Integuments with ir- 

 regular vermiform glands, anastomosing with each other, 

 and having a general longitudinal direction. Mantle 

 covering the whole body. Locomotive disk expanded at 

 its margin, and visible beyond the sides of the mantle ; 

 no median band. Respiratory orifice near the head. 

 Anal orifice contiguous to, and a little above and in 

 advance of, the pulmonary orifice. Orifice of organs 

 of generation behind and below the superior tentacle. 

 Without terminal mucous pore. No shell. 



