CORELLA LARVJEFOEMIS. 29 



Oral filaments minute, placed a little apart, not nume- 

 rous. Taitin-iiliti- Jili merits numerous, not crowded, 

 long, delicate, and colourless. 



Length from the base to the branchial aperture five- 

 eighths of an inch, and to the atrial aperture an inch 

 and a half. 



Hab. Shallow water. 



IRELAND. Roundstone Bay, Connemara, Galway 

 (More). 



First record. Hancock, 1870; coll. More, 1869. 



We have seen only two individuals of this very 

 characteristic species; they were both obtained in the 

 same locality, and were taken in shallow water (from 

 6 to 12 fathoms) by Mr. A. Gr. More in 1869. They 

 differ somewhat in colour ; one having the mantle of a 

 dull red, the other of a pale straw colour, and each 

 having a few scattered spots of red. The body is 

 much compressed and remarkably transparent, reveal- 

 ing almost the entire organization through the external 

 coverings. t But the most extraordinary feature is the 

 enormous development of the atrial tube ; it is con- 

 siderably longer than the whole length of the body, 

 and is proportionately wide ; it is placed at the top of 

 the ventral margin, only a short way removed from 

 the branchial aperture, which is exactly terminal, and 

 so little produced as to be scarcely tubular. From 

 the peculiar development of the atrial tube, the form 

 of this species has considerable resemblance to that of 

 the usual tadpole larva, and suggests the adoption of 

 the specific name. 



The mantle is firmly adherent to the test, so that it 

 cannot be detached without laceration ; it is exceed- 

 ingly delicate and but sparingly supplied with muscles. 

 On the rio'ht-hand side there are a few scattered 



O 



radiating fibres, darker than the rest of the mantle, 

 near the upper and dorsal margin ; there are likewise 

 a few at the ventral margin ; and a few still more 

 delicate fibres are seen at the upper border of the left- 



