I. '08. 



which are known to frequent the ocean floor, must be regarded 

 as members of the benthos as well as of the nekton. 



Only a very lew species are definitely associated with other 

 animals. Typton spongicola is found living within sponges of 

 the order Monaxonida, while Richardina spinicincta, the only 

 representative of the Stenopidea yet found in British waters, 

 is probably restricted to the areas peopled by the Hexactinellid 

 sponge, Phero7iema, and often referred to as the " Holtenia " 

 ground. Leontocaris lar has only been found on two occa- 

 sions, and in each haul Antipatharia and branching corals of 

 the genus Lophohelia occurred abundantly. This, coupled 

 with the highly specialized structure of the species, suggests 

 the possibility of an Alcyonarian association. 



The following table indicates the months in which ovigerous 

 females of the various species have been found off the Irish 

 coasts. Crangon vulgaris (which is omitted in this table) is 

 to be found bearing ova at almost any time of the year. It is 

 probable that on the Irish coast — as was found to be the case 

 in Lancashire (Herdman, 1893) — C. vulgaris has two prin- 

 cipal breeding periods : in late autumn and early summer. 



1-5 

















f4 





t^ 















a> 





a 













, 



-^ 





Xi 





t 

 < 



i 

 ^ 



6 



1-5 



»-5 



August 





o 

 o 

 O 



B 



(0 



> 



a 



o 



Pasiphae sivado 



Acanthephyra purpurea . . 

 Acanthephyra debilis . . . . 

 Nemaiocarcinus ensifer, v. 



exilis 



PandcUus Montagui . . . . 

 Pandalus propinquus 



Pandalus Bonnieri 



Plesionika martia 



Pandalina brevirostris 



Hippolyte varians 



Spirontocaris Cranchi . . 

 Spirontocaris pusiola . . . , 



Caridion Gordoni 



Processa canaliciilata . . . . 



Leander serratus 



Leander adspersus 



Leander squilla 



Crangon Allmanni 



Philocheras echinulatus . . 

 Philocheras trispinosus . . 

 Philocheras sculptus . . . . 

 Philocheras hispinosus . . 

 Philocheras hispinosus, v. 



neglectus 



Pontophilus' spinosus . . . . 

 Pontophilus norvegicus . . 

 Richardina spinicincta . . 



X 

 X 



X 

 X 

 X 



X 

 X 



X 

 X 



X 

 X 

 X 



X 

 X 



X 

 X 



X 

 X 

 X 



X 

 X 

 X 



X 

 X 

 X 

 X 



X 

 X 



X* 

 X 



X 

 X 

 X 

 X 

 X 



X 

 X 

 X 

 X 

 X 



X 

 X 



X 

 X 

 X 



X 

 X 



X 

 X 

 X 

 X 



X 

 X 

 X 



X 

 X 



X 

 X 



X 

 X 



* Only in deep water off the West Coast . 



