rKUBTAC'i Llffl 223 



1. CAJJCERILLA TUBITLATA. Plate I.X1I fig*. 1-6. 



Various reasons might be given, perhaps, and those sufficiently con- 

 \ ineing, for adding this animal to the lust of Kntomostraca, which, under 

 its present state, is rather indefinite. 



A young Ophiura, a kind of Star- fish, as above shewn, it* slender 

 rays expanding about nine lines, was taken in the beginning of May, 

 I'latc l.XII. fig. 1. A very minute foreign object was observed affixed 

 ti> it a fortnight later, at the root of one of the rays, but so much inter- 

 cepted, and so indistinctly seen, that ite precise form could not be deter- 

 mined. The ray, however, having fallen to pieces on the 25th of tin- 

 month, as incident to these animals, left the disc entire, where the ob- 

 ject was exposed as a prominence, fig. 2, and, on reversing the disc, it 

 appeared under the microscope, as in fig. 3, a. While clinging to the 

 mutilated disc, more of it was discovered than previously. 



This minute object proving a parasite, detached itself, when I con- 

 cluded it to be one of the Crustaceans, and probably allied to the Cancer 

 family. 



The shell, rather a clumsy oval, was of dull yellow colour, bearing a 

 red cross on the centre of the back, and a red speck in front ; its form 

 rudely triangular, the margin tolerably even, with two antenna> apart from 

 each other, rough, with hairs or bristles. No eyes were visible, probably 

 from the position, nor could I find above six legs, \\hirh were armed with 

 claws. The animal fell on its back, and the legs were in considerable 

 action. 



Two short cylinders, each crowned with a globular enlargement, 

 formed appendages to the body, when about twelve distinct vivid blue 

 ova could be enumerated in each of the spheres. On June 2, th- 

 were so far matured, that the form of the included foetus was perceptibly 

 irregular, as exposed through the integument. In two, a red speck like 

 an eye was observed. The whole parasite might have been inscribed 

 within a circle a line in diameter. 



The parent was dead on the 5th of July, and the internal part* 

 having decayed, only the shell, with its red cross, remained. 



