524: Dr. W. T. Caiman on Two Species 



Reference, letters. 



aff. Afferent edge of cteni- j ep.tent. Epipodial tentacles, 



dial leaflet. g.d. Gouaduct. 



ant.yl.gr. Anterior glandular m. Mantle. 



groove. j)i. (jl. Mucus-gland. 



alt. Line of attachment of op. Operculum, 



leaflet to branchial ospli. Osphradium. 



roof. r. Rectum. 



ct. Otenidium. s. Siphon. 



cff. Efferent edge of cteni- skel. Skeleton of ctenidial 



dial leaflet. leaflet. 

 eft'.n. Efferent ctenidial vessel. 



LXXI. — Note on Two Species of the Genus Pandalus. 

 By W. T. Calman, D.Sc. 



(Published by permission of the Trustees of the British Museum.) 



In a revision of the British prawns of the family Pandalidaj 

 published in 1899 (Ann. & Mag. Nat. Hist. (7) iii. pp. 27- 

 39) I pointed out that Pandalus bonnieri, Caullery, was 

 closely allied to P. leptocerus, S. I. Smith, found off the 

 Atlantic coast of North America, the latter species being 

 distinguished, however" by the minutely scabrous surface of 

 the body. Since then Dr. Appellof has suggested (' Meeres- 

 launa von Bergen,' Heft 2 & 3, Dekapoden CJrustaceen, 

 p. 118, 1906) that P. bonnieri should be regarded as " nur 

 eine ostlich-atlantische Varietat von leptocerus," since he 

 found some individuals to have scattered hairs on the carapace 

 (especially on the sides) and on the abdomen, and this view 

 has been adopted by several more recent writers. Having 

 lately had occasion to make a careful comparison of the 

 specimens of both forms in the British Museum collection, I 

 find that they are distinguished by several characters which, 

 though small, are constant as far as our material goes, and 

 show no evidence of intergradation. Whether the two forms 

 are to be regarded as species, subspecies, varieties, or local 

 races I do not know, nor can I regard the question as of 

 much scientific importance in the present state of our know- 

 ledge ; at all events practical convenience seems best served 

 by retention of the binomial nomenclature. 



Pandalus bonnieri, Caullery. 



Pandalus bonnieri, Caiman, Ann. & Mag. Nat. Hist. (7) iii. p. 34, 

 pis. i.-iv. fig. 3 (1899) (with synonymy); Sars, Rep. Norwegian 



