THE MOUNT DESERT REGION 263 



1 First to third abdominal segments laterally 



spinous gToenlandica 



These segments laterally rounded 2 



2 Rostrum about as long as eye 3 



Rostrum much longer than eye 4 



3 Two superior rostral spines behind and 3 in 



front of eye zebra 



One such spine behind and 2 in front of eye . . pusiola 



4 About 10 middorsal spines spina 



Four or 5 middorsal spines 5 



5 Three spines behind and one in front of eye . f abricii 

 Two spines behind and 3 in front of eye .... polaris 



S. GROENLANDicA (J, C. Fabricius). (Rathbun, 1929, p. 11, 

 fig. 8.) Found on rock and gravel bottoms, in 22 to 165 feet 

 of water, rather rare. Stations : D 3, 6, 30, 38, 39, 107, 117, 

 136, 148. 



S. SPINA (Sowerby). (Rathbun, 1929, p. 14, fig. 14.) Taken 

 on hard bottoms, from 22 to 330 feet. Uncommon, but most 

 frequent at D 39, 40. Stations : D 6, 37, 39, 40, 67-69, 71, 73, 

 75, 94, 96, 107, 117, 130, 135-138, 142, 146, 148. 



S. POLARIS (Sabine). (Rathbun, 1929, p. 12, fig. 9.) Taken 

 rarely in similar situations w^th the preceding, depth 20 to 

 100 feet. Stations: D 4, 6, 23, 32, 36, 38, 40, 43, 52, 64, 69, 

 92, 94. 



S. ZEBRA Leim. (Rathbun, 1929, p. 13, fig. 11.) Taken only 

 once, on rock, in 25 feet of water, at D 136. Previously re- 

 ported only from St. Andrews, N. B., and Nova Scotia. 



S. FABRicii (Kroyer). (Rathbun, 1929, p. 15, fig. 15.) Taken 

 on hard bottoms, depth 20 to 300 feet. The most common 

 species of the genus here. The best stations were D 39, 94, 

 107. It was taken in all at 48 dredging stations. 



S. PUSIOLA (Kroyer). (Rathbun, 1929, p. 17, fig. 19.) Also 

 found on hard bottoms, from low water to 239 feet. Not very 

 common, but being a small species it may escape through the 

 dredge net. This is the only species of the genus which breeds 

 in this region during the summer. Stations : D 1, 3, 4, 6, 15, 

 18, 20, 30, 35, 39, 40, 43, 69, 75, 82, 93, 94, 130; S 11. 



