Crustacea from Scottish Waters. 35 



" 50 miles N. by W. of Eagle Island, Co. Mayo." On 

 female 50 mm. was obtained at 700 fathoms *. Rev. T. R. R. 

 Stebbing remarks that Cystosoma has species which combine 

 a length of 4 or 5 inches with the respectable breadth and 

 depth of an inch in the amplest part of the head f- The 

 specimen from the Faroe-Shetland Channel, judged by 

 dimensions like these, must be regarded as a small." 



Copepoda-Calanoida. 



Genus PSEUDOTHARYBIS, T. Scott. 



Pseudotharybis dubius, sp. n. ( ? ). 

 (PI. III. figs. 1-15.) 



Body moderately stout, forehead rounded, rostrum small, 

 last thoracic segment scarcely produced and rounded at the 

 sides, abdomen and caudal rami short. 



Antennule on the (?) left % side composed of twenty-four 

 joints, the first two stout, other joints small, but the eighth 

 and the penultimate joints are rather longer than the others. 

 The (?) right antennule is composed of eighteen joints, but is 

 otherwise somewhat similar to the left; both are provided 

 with several short sensory filaments (figs. 2 & 3). 



Antennae with the inner ramus considerably shorter than 

 the outer, as in Tharybis, G. 0. Sars. 



Mandibles with the masticatory end truncated and armed 

 with strong teeth, and the palp is moderately large and two- 

 branched. Maxilla? nearly as in Tharybis. 



First maxillipeds small, but armed with two moderately 

 strong spiniform setas and a number of stout bristles (fig. 8). 

 Second maxillipeds somewhat similar to those of Tharybis, 

 but the first basal joint is furnished with stout, curved, spini- 

 form setae on the inner distal angle in addition to several 

 bristles (fig. 9). 



In the first pair of swimming-feet the spines on the outer 

 distal angles of the first and second joints of the outer 

 branches are long and slender. The exterior marginal spines 

 on the outer branches of the other three pairs are also mode- 

 rately elongated, while the terminal spines are nearly one and 



* u Pelagic Ainphipoda of the Irish Atlantic Slope," Fisheries, Ireland 

 Sci. Invest. 1905, iv. (1906) p. 17. 



t ' A History of Crustacea,' p. 30. 



X The antennules were dissected off and mounted ere the difference 

 between them was observed, and there is some doubt as to which is right 

 and which is left. 



