244 



L. A. BORRADAILE. 



notches separating it from the orbits, but no outer lobes ; the anterolateral edges short, with 

 two big blunt triangular teeth behind the orbital angle, and a small notch, rather than a pro- 

 jecting tooth, at the junction with the posterolateral edge ; the hinder edge slightly hollowed ; 

 the chelipeds equal, smooth, without spines but with a blunt tooth at the inner angle of the 



Fig. 45. Pseudozins laevis; a. whole animal, b. outside of hand. 



wrist, the fingers compressed, grooved, not gaping, each with a row of triangular teeth inter- 

 locking with those of the other; and the walking legs long, slender, sparsely hairy, and with- 

 out spines, except on the dactylopodite of the last leg, which is rather broad, while those of 

 the other walking legs are very long and narrow." 



Length : 5 mm. Breadth : 6 mm. Colour in spirit : white. 



One male specimen dredged in 20 fathoms in Suvadiva Atoll. 



Genus Pilumnus, Leach, 1815. 



As a general rule the species of crabs are not local in distribution, but are spread over 

 wide areas and are probably correlated with habitative ' rather than geographical diiferences 

 in environment. There are, of course, exceptions to this rule, as for instance the land and 

 freshwater crabs of the genera Sesarma and Potamon. Pilumnus is another of these excep- 

 tions, as may be seen at once on looking down a list of the known species, when it will be 

 evident that many of them have been only recorded from one locality. This impression is 

 strengthened on reading the remarks of various authors in recording a species from a new 

 locality. In many cases the identification is doubtful, or the description does not tally with 

 that of the original specimens. The present collection affords an excellent example of this, 

 not one of the 11 species being represented by specimens which exactly obey former diagnoses. 

 Under the circumstances I shall describe as new species the forms which do not agree 

 closely with specific de.scriptions already published, and rank as subspecies'- those which in- 



' For the meaning of this word, see p. 195 of Part II. of 

 this publication. 



- See footnote to p. 195 of Part II. of this publication. 



