of the North Atlantic and of North- Western Europe. 691 



there are two long ordinary setse and three short sensory filaments ; the hooked 

 process is on the right ,'^ide, strongly falcate, bent almost at a right angle, and 

 slightly bulbous at the apex, where on the inner margin there is a series of minute 

 hair-like crenulations (fig. 15 a) ; the hook of the left side is not so strongly arched, 

 nor is it much dilated at the apex. The labium consists of two cushion-like 

 eminences, which are thickly clothed with long flexuous hairs. Biting plate of the 

 mandible (figs. 12, 13) armed with four very stout dagger-shaped lateral teeth, and 

 at its base with a dense growth of hairs, which, in the female, are for the most part 

 blunt and truncated, as if broken or shorn off in the middle. The caudal laminae 

 [fig. 16) are short and broad, with rather stout ungues, which increase suc- 

 cessively in length from the first to the last, and are finely, but very distinctly, 

 pectinated on their concave margins. Length of the female, 3 mm. ; of the male, 

 2'55 mm. 



We liave seen only three specimens of this species. These occurred in a tow- 

 net gathering made by Professor Haddon at a depth of 200 fathoms, 40 miles off 

 Achill Head, Ireland. 



8. Conch.oecia subarcuata, Claus. 



1890. Conchoecia suharcuata, . . Claxis, " Die Grattungen und Arten der med- 



iterranen und atlantischen Halocypriden," 

 p. 9. 



1891. ,, ,, . . Claus, "Die Halocypriden des atlantischen 



Oceans und Mittelmeeres," p. 58, pi. iii., 

 figs. 3—9, pi. iv. 



Shell almost twice as long as high ; length, 1'8— 2*lmm. ; height, 1-1-2 mm. 

 Like C. magna, but more elongated, and with a more strongly arched ventral 

 border, and a more curved rostral process. Frontal tentacle of the male with 

 a club-shaped, dilated, almost rectangularly bent capituluni ; tliat of the female 

 angularly bent, with a long, dilated apex, which is produced into a strongly 

 hooked point, and is beset on the lower border with fine spines. The antennules 

 of the male have the terminal seta armed with about thirty pairs of closely set 

 booked processes, which are shovel-shaped at their bases. 



This species is, according to Professor Claus, very like C. magna, and was 

 taken in a depth of 1500 metres in lat. 37° 45' N. ; long. 13° 38' W. ; also in 

 500 metres at Funchal, and at the surface of the Atlantic Ocean, on December 

 1st, 1887. 



