342 Mr. E. J. Miers on new Species of 



two or three spines. Anterior legs rather long ; arm with 

 three or four spines on the front margin ; wrist with a very 

 long spine on its inner margin, and two or three smaller 

 spines on its outer surface ; hand with five spines on its upper 

 surface, three on the outer and two on the inner margin ; ex- 

 ternal surface gra'nulous. Third joint of posterior legs with a 

 strong spine at its infero-distal extremity. Colour of a rich 

 blood-red. 



Length If inch ; breadth at fifth marginal tooth 2| inches. 



Hob. Samoa Islands. 



This species is distinguished by the close short pubescence, 

 the form of the frontal lobes, and the existence of only four 

 teeth on the antero-lateral margins. The species of the genus 

 have normally five teeth, of which the fourth may be rudi- 

 mentary. The rudimentary fourth tooth, however, according 

 to M. Alphonse Milne-Edwards (Nouv. Arch. Mus. Hist. Nat. 

 1873, ix. p. 163), is occasionally absent in Th. Savignyi } a 

 species with only four frontal lobes. 



Leucosia Whitmeei, sp. n. 



Carapace subglobose, closely punctate on the sides, narrowed 

 and produced anteriorly. Front slightly relevate, concave 

 above, obscurely tridentate ; the median tooth very small, and 

 not more prominent than the lateral ones. Thoracic sinus 

 deep and well-defined, with a smooth, obscurely beaded margin, 

 narrow at base, slightly widened anteriorly and rounded in front. 

 Anterior legs of moderate length ; upper surface of arm with 

 an anterior and a posterior longitudinal line of tubercles, 

 several above and below at the base, and two or three placed 

 in an oblique series on the upper surface near the base, of the 

 arm ; wrist quite smooth ; hand rather longer than broad, 

 compressed, outer margin with a thin smooth ridge, inner 

 with an obscurely beaded line ; fingers small, meeting only 

 at the tips. Abdomen of male narrowest between the pen- 

 ultimate and antepenultimate joints ; the tubercle on the pen- 

 ultimate joint very small, acute. Colour greyish brown above, 

 pinker on the sides and on the legs, with a semicircular line 

 of five brown spots, two at the back of each branchial and 

 one at the back of the cardiac region, and six white spots, 

 three on each side of the gastric region. 



Length nearly f inch, greatest width f inch. 



Hob. Samoa Islands. 



This species may be distinguished from all others with a 

 tridentate front by the slight prominence of the median tooth, 

 the form of the thoracic sinus, and the coloration of the 

 earapace. 



