PANDARUS BICOLOR. 97 



Scijllium catulus ; and Squalus mustelas. Falmouth 

 1849 (W. P. Cocks see Baird). Torcross, Devon (Dr. 

 Leach). Plymouth (A. M. Norman and B ass ett- Smith). 

 Firth of Clyde, Aberdeen, Moray Firth (T.' Scott). 

 Shetland (C. B. Wilson). Irish Sea (A. Scott). 



This appears to be the only British species of Pandarus 

 recorded hitherto. Pandarus boscii Leach is considered to 

 be only a pale-coloured variety ; an apparently similar variety 

 pale-coloured is recorded in the 26th ' Annual Report of 

 the Fishery Board for Scotland/ Part III, p. 74, pi. iii (1909). 

 It was obtained along with specimens of the typical form on 

 a number of Squalus acanthias captured on the West Coast 

 of Scotland in March 1908. Pandarus fissicornis M. Edw. 

 is regarded by Kroyer as synonymous with the present species, 

 and Canon A. M. Norman considers that the species described 

 by Gerstaecker under the name of Nogagus angustulus is the 

 male of this Pandarus. The i'ernale of the typical form is 

 ornamented on the back with dark-brownish or almost black 

 coloured patches. The carapace is usually coloured, and so 

 are the second and third pairs of thoracic plates. 



Genus 16. CECROPS Leach, 1816. 



Female. Carapace oval, robust, distinctly notched 

 in front and deeply excavated posteriorly. Frontal 

 plates coalescent with the carapace. Second thoracic 

 segment with tolerably large rounded lateral lobes, 

 and the last one with a pair of short dorsal plates. 

 Genital segment small but provided with considerably 

 expanded dorsal plates, larger than the carapace, and 

 reaching backward so as to conceal the short caudal 

 rami. Abdomen small, somewhat flattened. 



Antennules small, two- jointed. Antennae moderately 

 stout, each terminating in a strong hook. Mandibles 

 and other mouth-organs of the usual caligoid type. 

 All four pairs of thoracic legs biramose. Both rami 

 of the first three pairs composed of two joints, and 

 those of the fourth pair of one joint. 



Male. The male, which is smaller than the female, 

 is similar to it, except that the genital segment wants 



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