1 1 



lias usually been observed in less deep water, so e. g. off Lion's Head, South Africa, in 131 

 to 136 fathoms, Pies. Parfait i (A. M.-Edw.) and Pies. geniculata (A. M.-Edw.) dredged by 

 the "Travailleur" at a depth of 73S fathoms and, finally, the little Pies. capreensis Lo Bianco, 

 which was taken in 1260 fathoms near the island of Capri. 



Key to the indopacific species of the genus / 'lesioniéa Bate. 



a l The legs of the 2 nd pair are of equal or nearly equal length. 



^ Rostrum longer than antennal scale (in one species, Pies. 



brevirostris Bate, in which the rostrum is about as long as 



the scaphocerite, the lovver border is smooth, while the upper 



is smooth beyond the basal joint of antennular peduncle). 



c x The dorsal border of the rostrum, beyond the tip of the 



antennular peduncle, is quite smooth. 



d x Lower margin of the rostrum dentate. 



<?j The ventral border of the rostrum is very closely and evenlv 



serrated; ocellus distinct. 



/j The posterior border of the 3 rd abdominal tergum, though 



convex, is not acutely produced. 



g x Rostrum from 45 to 67 per cent. of the length of the 



body, when the body is measured from the back of 



the orbit to the tip of the telson martia (A. M.-Edw.) 



(A. MlLNE-EDWARDS, Recueil de Figures de Crustacés nouveaux ou peu 

 connus, lère Livr., 18S3, PI. 21). 



g„ Rostrum from 34 to 47 per cent. of the length of the 



body, when the body is measured from the back of 



the orbit to the tip of the telson . . martia (A. M.-Edw.) var. scmilaevis Bate 



f s The posterior border of the 3 rd abdominal tergum is acutely 



produced into a sharp tooth that overlaps the next tergum ensis (A. M.-Edw.) 



(A. Milne-Edwards, in: Annal. Sc. Nat., Zool. (6) XI, 1SS1, Art. 4, p. 14; 

 Recueil Fig. Crust. nouv. 1S83, PI. iS). 



e„ The ventral border of the rostrum is armed with a series 



of distant spines ; no ocellus Alcocki (A. R. S. Anderson) 



(A. R. S. Axderson, in: Journ. Asiat. Soc. Bengal, Vol. LX V, pt. 2, 1896, 

 p. 92; Illustrations of the Zoology of the Investigator, Crustacea, PI. LU, 

 Fig. 2cf, Fig. 49). 



d % Lower margin of the rostrum free from spines, rostrum 



subequal with the antennal scale brevirostris Bate 



;C. Spence Bate, Report Challenger Macrura, 1S8S, p. 650, PI. CXIII, 

 fig- 5)- 



C 2 At the base of the rostrum two strong teeth stand above the 

 eye ; of the rostrum proper the hindermost third is unarmed, 



SlEOGA-EXrEDlTIE XXXIX a 3 . : 5 



