224 CRUSTACEANS. 



Fortunately, the young, which had been hatched a day or two pre- 

 viousl}^, survived ; they were extremely minute, jirovided with six legs, 

 and had a red speck on the surface of the shell, towards the anterior. — 

 Plate LXII. fig. 5. 



My convenience was neither such, nor the position of the animal so 

 favourable, as to admit minute and accurate inspection of all the parts, 

 whence the preceding must be taken only as a general view of the sub- 

 ject. Besides, my reluctance to advert to a single specimen is notorious. 

 I should avoid doing so, but from the chance that some one better in- 

 formed, may be able to supply what I am compelled to leave deficient. 



It is extremely probable that what was exposed, will prove that this 

 creature may belong to the Cancer tribe, and that it may be classed as 

 an unknown genus, closely allied to the Entomostraca, especially as in- 

 dicated by the globular ovarian appendages. The red speck ma}^ be an 

 eye, and the feathered antennse, if they be trul}^ such, may assist us in 

 assigning the animal its true position. 



I have never seen any instance wherein the microscope proved so 

 useful an auxiliary. 



No other specimen has occurred. 



Plate LXII. 



Fig. 1. Young Ophiura. 



2. Disc of the same. — Cancerilla, a. 



3. Disc of the same. — Cancerilla, a, 



4. Cancerilla detached from the Ophiura, enlarged. 



5. Young Cancerilla from the ovarium of fig. 4. 



§ 2. AsTARiciLLA. — Plate LXII. figs. 15, 16, 17. 



The subject of this paragraph being originally weak, mutilated, and 

 imperfect, must be considered as involving many difiiculties opposing 

 correct observation. I say nothing of diminutive size if all the parts be 

 present, though that is also an embarrassment ; but where the organs 

 are actually wanting, it is obvious that our endeavours to supply the defi- 

 ciency may lead us very far astray, unless for one individual. I have 



