174 MEDICAL ZOOLOGY. 



MOLLUSOA, 



SEPIA (Cuttle-fish). Cephalopoda. Family Sepiadae. 



Body oblong, with lateral fins as long as itself, shell as wide and long as 

 body, very thick in front, concave internally behind, terminating in a prom- 

 inent point. (Forbes and Hanley.) 



S. officinalis, D'Orbigny. Body large, ovate, fleshy, depressed, ronnded 

 behind, with a rounded projection on the front of dorsal edge, surface of the 

 body smooth. Fin narrow, lateral, bordering the whole side of the body, 

 and separate behind. The ventral part of the mantle furnishrd with an 

 oblique oblong tubercle fitting to a concavity in the sides of the lower part 

 of the siphuncle. Head large, wider than long, with two elongated and 

 some smaller beards above. Eyes large, with an inferior eyelid, and a lach- 

 rymal opening in the front of the folds of the eyelid. Ear at the lower part 

 of the globe of the eye. Buccal membrane seven-lobed, the two lower lobes 

 least marked. Arms short, strong, unequal ; order of length, 4, 3, 2, 1 ; ring 

 of cups smooth, entire. Tentacular arms much enlarged, with six alternating 

 lines of cups, the five central cups much larger ; ring of the larger cups 

 smoothed, of the smaller ones toothed. Shell ovate, compressed, wrinkled 

 above, semi-cartilaginous on the edge and behind, rounded posteriorly, em- 

 bedded in the back of the animal. Siphuncle large, short, without any band 

 at the junction to the head, and with a large internal valve. Back purple, 

 with darker cross-bands, forked, and with small white spots on the side. 

 (Howe.) 



Measurements. 8"-9"long; 6" wide. (Forbes and Hanley.) 

 Habitat. Atlantic Ocean, coasts of Europe and Africa, Mediterranean. 



PEOTOZOA. 



INFUSORIA. Virgulina tenax. Body elongated, membranous, transpa- 

 rent, somewhat thickened at its anterior part ; it is furnished with a tail one- 

 third or one- fourth shorter than body. 



Measurement. rg^a" long. 



Found in tartar of the teeth. (M. Tandon.) 



Vibrio, Mliller. Body filiform, more or less distinctly jointed from imper- 

 fect division ; vacuolae distinct, globular hyaline ; movement undulatory. 



