SPH^EROMIDJE. 45 



portion is absent, and that in the two pairs of maxillae and in the 

 maxillipeds the lobes are greatly reduced in size ; but, on the 

 other hand, it will be noticed that the outer member of the first 

 maxillse, and the basal joints of the second maxillae, and 

 especially the same joint in the maxilliped, are considerably 

 expanded in width. Thus it would appear that the entire 

 mouth-organs have assumed a structure which should at first 

 supply a cap to hold in the embryos, and subsequently, when 

 the cap is thrown open, to allow the young to escape ; there 

 is an absence of all spines and sete which might interfere 

 with their outward passage.* 



Cymodoce truncata is found along the coasts of Devon and 

 Cornwall ; it is to be met with all the way up the western 

 side of Great Britain, having been taken by A. M. N. in the 

 Minch (1866) and at Shetland (1863); we have received it 

 also from St. Andrews (MclntosK); southwards it has been 

 taken by A. M. N. at Naples. It would seem also to be the 

 Sphceroma granulatum of H. M. -Edwards, and S. mtbro- 

 punctatum, Grube ; under which names we have received 

 Adriatic specimens from Professor Heller (Heller, Carcinol. 

 Beitr. zur Fauna des adriat. Meeres, 1866, p. 25). 



DYNAMENE MONTAGUI, Leach. 



Mr. Stebbing has suggested that this may be the 

 immature state of Nccsa bidentata, 6 . This may prove to 

 be the case. 



Devon (Leach); Torquay (Stebbing). 



N^ESA BIDENTATA (Adams). 



1868. Nasa bidentatct, B. & W. vol. ii. p. 431, rf . 



1868. Di/namene rubra (Montagu), B. & W. vol. ii. p. 419, $ . 



1868. Dynamene viridis (Leach), B. & W. vol. ii. p. 421, . 



Dartmouth, Plymouth, Polperro, Falmouth (A. M. A".); 

 Torquay (Stebbing). 



CAMPECOPEA HIRSUTA (Montagu). 



1868. Campecopea hirsuta, B. & W. vol. ii. p. 434, rf . 



1868. Campecopea Cranchii (Leach), B. & W. vol. ii. p. 436, $ . 



Devon (Montagu) Falmouth and Polperro (Sate) ; Fal- 

 mouth (A. M. N.) ; Torquay, in all localities where Lichma 

 pygmcea is to be found (Stebbing) ; Plymouth (Biol. Lab.). 



* While this was in the printers' hands we learnt that Hansen had 

 sent a paper for publication to the Quart. Journ. Micros. Sci. on the 

 Family Sphteromidae, in which he arrives independently at conclusions 

 for the most part similar to our own. From subsequent correspondence 

 with him we find that he holds different, and perhaps more correct, views 

 as to the mode of escape of the young. 



