140 Transactions of the Royal Canadian Institute 



The number of terminal spines on the telson is subject to some 

 variation being usually six or eight but occasionally five. 



Dimensions. — Females vary in length from 58 to 21 mm., and males 

 from 49 to 9 mm. 



Distribution. — New Brunswick; Bay of Fundy, 'Prince' Sta. 5 and 

 Sta. 120: Grand Harbour, Grand Manan: Green Islands, Grand Manan. 



Spirontocaris groenlandica (Fabricius, J. C.). PI. IV, fig. 11. 



Colour. — Both the shade of colour and the pattern vary much in this 

 species. The colour is usually a brownish red but may show all stages 

 between this and a dull brownish green. The greater part of the animal 

 is coloured. On the cephalothorax there are usually the following non- 

 coloured portions — a small area just posterior to the eye, one dorsal to the 

 pterygostomial spine, one running ventrally from the second dorsal 

 carapace spine, one just posterior to the fourth dorsal spine and several 

 scattered smaller areas, which with the exception of five along the pos- 

 terior half of the ventral edge vary considerably in position. On the 

 abdomen the principal non-coloured areas are — one running across the 

 first segment on its dorso-lateral surface, several scattered ones on the 

 second segment, one on the dorsal surface of the third segment at its 

 anterior end, one on the dorsal surface of the fourth segment, a narrow 

 band running across the fifth segment which is continued into the sixth 

 for a short distance and which is continuous with that of the fourth 

 segment anteriorly. The ventral edges of the abdominal segments are 

 red. The rostrum, antennules and antennae with scattered dots of 

 colour; the flagella of the antennules and antennae with bands of colour, 

 these not being complete in the case of the larger flagellum of the anten- 

 nule. Terminal joint of the third maxillipede with two coloured bands, 

 the penultimate with two and the basal joint with one at its distal end. 

 First and second pereiopods with several bands; third to fifth with two 

 bands on merus and propodus and one on carpus and dactyl as well as 

 some colouring on the basal joints. The proximal half of the lateral 

 surface of the protopodites of the pleopods coloured. 



Variations. — The rostrum varies considerably, in some being very 

 stout and in others rather slender; the latter condition obtains in the 

 case of the males to a greater extent than in the females. In the males, 

 too, the abdominal segments are not as wide compared to their dorso- 

 ventral length as they are in the females. 



The following table gives the variations in the number of spines. 

 The figures indicate numbers of individuals. 



