216 HISTORY OF BRITISH CRUSTACEA. 



Firth of Forth (Goodsir) ; Strangford Lough (Hyndman 

 and Thompson) . 



Caprella acutlfrons. LeacJi's Skeleton Screw. — Head 

 oval, surmounted by a point j lower antennae much ciliated; 

 first joint of thorax cylindrical, not thicker than the head. 



British coast. 



Caprella phasma. Montagu s Skeleton Screw. — Head 

 round, surmounted by a point; first joint of thorax nar- 

 rowed behind, armed with two strong spines one before the 

 other. 



South of Devon (Montagu) ; Isle of Man (Dr. Fleming). 



Colonel Montagu, in the 'Linnean Transactions/* records 

 his observations on the Caprella phasma. He remarks that 

 "the female differs in possessing several plates or valves 

 beneath the body, situated between the two pairs of fins ; 

 the office of these is to carry and protect its eggs or young, 

 at which time they extend very considerably, and form a 

 kind of pouch. We have seen this receptacle distended 

 with ova, from fifteen to twenty, readily distinguished through 

 the transparent plates. In this part a very strong pulsation 

 is observable. 



"While examining a female in a watch-glass of sea- water 

 * Vol. vii. p. 67. 



