DuERDEN — On some neio and rare Irish Poli/zoa. 131 



figure of T. flava, I should be niuch more inclined to consider it as 

 related to T.pedicellata, since, in this species, there is no sharp line of 

 demarkation between the stalk and the zocecium, such as exists in 

 both T. horenii and T. loecMi. However, the number of tentacles 

 given shows a considerable difference between the two. 



2. Triticella loechii, G. 0. Sars. PL Y., figs. 2, 6. 



Triticella hoechii, G. 0. Sars, Christiania Vidensk. Selsk, Forh. 1873, 

 p. 387, pi. viii. ; Hincks, Brit. Mar. Pol., p. 546. 



Zocecia horny, growing in dense groups from a continuous crust, 

 lateral surface obliquely oval, posterior extremity incurved, dorsal 

 margia subsigmoidal, sharply curved beyond the middle, ventral side 

 almost entirely occupied by the elliptical area. Frenaculum very 

 distinct and thick, placed about one-tliird the length of the cell from 

 the base. Peduncle about three times longer than the zocecium. 

 Polyfide with 20 tentacles. 



This species was founded and first described by Professor G. 0. 

 Sars, who obtained it growing on Geryon tridens from Christiania 

 Sound. Mr. Hincks, in his description of T. Tcorenii, G. 0. Sars, 

 states that T. loechii may probably occur on the British coasts, and 

 gives one of Sars's figm-es. It is therefore with considerable pleasure 

 that I am able to announce its discovery on the west coast of Ireland. 

 It was obtained, covering the eye-stalks and front portion of the 

 carapace of Portunus depurator from Berehaven, by the Royal Irish 

 Academy Expedition of 1885, at a depth of 7 fathoms. 



It is closely related to T. Icorenii, G. 0. Sars, but differs from it in 

 the smaller size of the zocecia, the greater curvature of the dorsal 

 side, and especially in the well-developed frenaculum or curved 

 chitinonsband. This, at the dorsal surface, is considerably thickened, 

 but thins away towards the upper part of the ventral surface. It is 

 also farther from the base, being placed at about one-third the length 

 of the zocecium from the peduncle. The continuous hoi'ny crust, which 

 seems to be characteristic of all the Triticellae, was first observed by 

 Sars in this species. 



Halitat. — On various Crustacea from shallow water. 



Localities. — Berehaven, S. W. of Ireland ; on the eye-stalks and 

 carapace of Portunus dejmrator, from a depth of 7 fathoms (Roy. 

 Irish Acad.). 



Geographical Distribution. — Christiania Sound ; on the carapace 

 and appendages of Geryon tridens, from about 15 fathoms (G. 0. Sars). 



