252 PARASITES. 



with its inflexible deadly organs, is advanced into the fleshy parts of the 

 prey. It rather appears to be stationary ; and it requires to be very 

 carefuUy withdrawn, for in the course of extrication, the upper portion, 

 with the arming apparatus, is usually broke off, though the lower part 

 remains fuU of blood. On emptying the latter, however, which may be 

 done by pressure, its elastic figure, quite transparent, is discovered. 



PlATE LXVII. 



Fig. 1. Lerncea hranchialis. 



2. Entire specimen, apparatus of the head, a ; lower extremity. I ; 



ovarian tubes, c. 



3. Another specimen, having lost the extremity, a, in the course of ex- 



trication. Lower e.xtremity, I ; ovarian tubes, c. 



4. Ovarian tubes, enlarged. 



5. Empty specimen. 



§ 4. BoTRYLLOFER. — Plate LXVII, fig. 6, enlarged ; natural length, a. 



I speak provisionally of the precise place and the parts of this sub- 

 ject, having been unable to satisfy myself, from a single specimen, of the 

 most important facts, namely, whether it is Crustacean, and whether a 

 Parasite. It was found among the residue of general marine collections 

 several years ago, nor have I ever seen any resemblance to it before or 

 since. 



Length, three-eighths of an inch ; greatest breadth of the bodv 

 about half as much. 



The subject consists of two parts, probably as distinct in use as in 

 form. The chief portion or body consists of a rudely quadrangular 

 flattened substance, wherein were very obscure indications of something, 

 like several pairs of limbs, on each side of an internal vessel ; the shoulder 

 is prolonged, in a general tapering form, to what is probably the ex- 

 tremity of a snout, from the sides of which originate about four pair of 

 grape looking organs, with several others along the shoulder. But the 

 whole was so imperfectly seen that I cannot venture to say any thing 

 very positive regarding it. The drawing, however, was executed by a 



