no. 3618 GONODACTYLUS — MANNING 19 



Lateral processes of sixth and seventh thoracic somites rounded 

 anteriorly and posteriorly; process noticeably larger on sixth somite. 



Carinae of sixth abdominal somite swollen, with or without posterior 

 spines. 



Telson with length and width subequal, appearing elongate, with 

 3 pairs of marginal teeth, submedians with movable apices; inter- 

 mediate teeth well developed, apices angled but not sharp; lateral 

 teeth obscure, apices not projecting much past lateral margin of 

 telson; telson without dorsal spinules or tubercles; median carina 

 very inflated and rounded in males, almost fusing laterally with dorsal 

 submedians, more oval in females, rarely with posterior tubercle; 

 knob not distinct, fused to median carina; carinae of marginal teeth 

 inflated; numerous submedian denticles present; 2 sharp intermediate 

 denticles present, recessed slightly, not projecting posteriorly past 

 apex of intermediate tooth; submedian teeth relatively slender, 

 ventral surface lacking longitudinal carina. 



Basal segment of uropod lacking prominent lobe or projection 

 on dorsal surface inside dorsal carina; inner margin of proximal 

 segment and all of distal segment of exopod with single row of setae; 

 proximal segment of exopod with small, fixed spine on distal end of 

 ventral surface; endopod short, broad, completely fringed with setae 

 set in 1 row; inner spine of basal prolongation slender, shorter than 

 outer. 



Color. — Faded in most of the specimens reported herein. Some 

 of the specimens from Guam show traces of a dark median patch on 

 the sixth thoracic and first and fourth abdominal somites. 



Size.— Males, TL 13.4-18.8; females, TL 13.0-24.2. Other measure- 

 ments of male, TL 18.6: carapace length 3.9; fifth abdominal somite 

 width 2.9; telson length 2.5, width 2.6. 



Discussion. — It is with some hesitation that I assign these small 

 but obviously mature specimens to Lanchester's species without 

 comparison with his type. The specimens agree well with the 

 illustration of the telson provided by Lanchester, the only major 

 difference being that in males the accessory median carinae may 

 be completely obliterated by the tumid median carina. 



In smaller specimens of either sex the accessory median carinae 

 can be distinguished as swollen lobes separated from the posterior 

 end of the median carina by a shallow lateral depression. In only 

 one of the specimens the median carina of the telson is provided 

 with a median, posterior tubercle. 



Gonodactylus confinis de Man, 1902, from Ternate, Indonesia, 

 appears to be similar in general telson structure, but, according to 

 de Man's account, that species has a median and two submedian 

 spinules on the end of the swollen median carina. If de Man's 



