DECAPOD CRUSTACEANS OF THE WEST INDIES 



125 



through merus lavender to mauve; carpus and extensor part of 

 propodus brick red; flexor part of lateral surface red with lavender 

 wash, small laterodistal area vermilion; proximal portion of extensor 

 surface of dactyl vermilion fading to white distally, proximolateral 

 area with lavender wash, mesial surface lavender fading to white; 

 apical claw (spine) black. Basal segments of third pereiopod cream to 

 lavender; merus mauve laterally and lavender mesially; carpus 

 purplish red laterally, lavender mesially; propodus brick red laterally, 

 lavender with longitudinal red ridge mesially; dactyl brick red laterally 

 fading to white distally, mesial surface lavender, fading to white 



Figure 34. — Sexual characters: a, right first pleopod in anterior view of male Petrolisthes 

 quadratus shown in figure 32; b, coxae of fifth pereiopods in anterior view of male Coenobita 

 clypeatus shown in figure 33; c, same denuded. 



distally, apical spine black; all lateral tubercles on leg dark red. Fourth 

 and fifth pereiopods lavender to white, tubercular patch on fourth 

 black, that on fifth dark chocolate. 



Material examined. — The Dominican collections contain 26 males 

 (total carapace lengths in midline 4.3-26.8 mm), 25 females (cl 

 4,1-22.0 mm), and 5 juveniles (cl 2.1-3.6 mm). The sexual pores on 

 the coxae of the fifth pereiopods in the males and the third pereiopods 

 in the females are usually not discernible in specimens with a carapace 

 length of less than 4.0 mm. 



Ecological notes. — This terrestrial hermit crab occurs throughout 

 all of the coastal parts of Dominica that were visited by the observers, 

 even on cliffs that rise as much as 100 feet above the ocean. Occasional 



