418 



the base to a conical prominence tipped with a delicate bristle, inner portion 

 jerted to a strong spiniform projection flanked inside by 2 slender bristles 

 and outside by a single smaller one. 



i olc.iir not yet ascertained. 



Length of adult female 7<) nun. 



/.' /////.>. This is another form at lirst described by Th. Scott as a 

 species ,,f the u'einis '/'< //'/// 'IH'ICI'IIS, but recently removed from that genus Indeed, 

 the present form exhibits se\er;d very striking peculiarities, which seem fully to 

 justify its separation from any of the 4 preceding genera. It may here be 

 noted, that the ." genera treated of in the [(receding pages, though apparently 

 well defined, exhibit a certain relationship to each other distinguishing them from 

 the other genera included in the family Canthocamptidce. It therefore appears 

 not improbable that in future it will be found appropriate to combine these genera 

 into a separate family, which in some respects would seem to approach that of 

 the Cylindropsyllidce. 



Occurrence.- Only ^ female specimens of this form have as yet come under 

 ni\ not) They were found in the same samples as those from which the 3 

 preceding forms were derived. 



J)i*tt-ilittlimi. Scottish coast (Scott). 



G 11 Leptomesochra, GK o. Sars, n. 



Generic (.'hni-urtn^. -Body narrow and elongated, with rather thin integ- 



umeiits. Kostnim obsolete. Genital segment in female not subdivided. Caudal 



limn eomp;ir;itively short, with the apical setse of normal structure. Anterior 



anti-nine very slender and ipiite unarmed; those in male slightly hinged. Posterior 



antenna- with the proximal joint distinctly subdivided, outer ramus small, hi- or 



uuiarticiilate. .Mandibles with the masticatory part narrowly excelled, palp well 



developed, biarticulate, with the basal joint more or less expanded and in some 



carrying a rudiment of ;in outer ramus Maxilhe small, with the exopodal 



and epipmlal lobes imperfectly develuped. Anterior maxillipeds short and stout, 



with the dist;il joint produced inside to ;i very long claw-like spine, basal seti- 



leioiis lolies iin perft et ly developed, apical part inconspicuous. Posterior max- 



illi|n-ds normal. 1st pair of le-s of comparatively feeble structure, though 



disiinetlv prehensile, inner ramus longer than the outer and in most cases biarti- 



cuhite. The :; siiceeeding pan's of legs well developed, with the outer ramus 



rathi-r larL'i-. inner much shorter and Inarticulate, except in the 4th pair, where 



it is more geiier.-illv eumposrd of :i well-detined joints; natatory setaj in both 



