434 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



stages (of which the species is indeterminate) occur 

 during the autumn sparsely. One specimen was found 

 in August which seemed to belong to Spiropagurus, but 

 that adult has not yet been recorded from this district. 

 Porcellana longicornis (among the specimens described 

 under this name there are probably included some of 

 P. platycheles) is very common in the later months. 



In the printed lists of plankton records by the 

 L.M.B.C., the greater number of Macruran larvae seem 

 to be entered under the head of " Mysis stage of 

 Crangon." As a matter of fact, the zoea and other 

 young stages of Crangon and other allied shrimps are 

 by no means abundant in Prof. Herdman's plankton 

 collections, far the most common Macruran being 

 Pandalus. This genus is represented by two species, 

 P. brevirostris and P. montagui, the former of which is 

 much more common than the latter. Mr. Kiddell has 

 found in addition P. bonnieri in the hauls from Cardigan 

 Bay, but this species does not appear to occur as far 

 north as Port Erin. P. brevirostris is present in both 

 spring and autumn hauls, but P. montagui was not found 

 except in the early part of the year. Crangon sp. 

 occurred fairly commonly in spring and less so in 

 autumn in all its larval stages. Hippolyte varians was 

 present in the spring, and at the same time other larvae 

 closely resembling Hippolyte were found which I could 

 not identify. Nephrops norvegicus was common in what 

 Sars calls the first and last stages during April. 



No larvae of Homarus vulgaris were found in the 

 zoea stages, but advanced " lobsterlings " (4th stage ?) 

 occurred in August and September. 



There are several common zoea and mysis stages of 

 Macrurans, which do not admit of identification at 

 present, occurring at various periods of the year. These 



