CRUSTACEA DECAPODA— BORRADAILE. 107 



(ii) The postocular spines are shorter (not reaching the tip of the spine of the 



eye-hood) and stouter, 

 (iii) The gastric region of the carapace is only very faintly tuberculate. 

 (iv) The last spine on the hepatic region is smaller than that l^efore it. 

 (v) The basal joint of the antennal stalk has a strong spine directed forwards as 



well as outwards, and serrate on its outer side. 



The specimen (a female) measures 1 cm. in length. 



Unfortunately the chelipeds are wanting. Probably the species belongs to the 

 type-subgenus. 

 Station 96. 



Sub-tribe OXYSTOMATA. 



Family LEUCOSIIDAE. 

 Sub-family LEUCOSIINAE. 

 46. Persephona {Myropsis) laevis, n. sp. Fig. 16. 



Diagnosis.- — Carapace longer than broad, smooth and minutely pitted, except on 

 the hinder edge, where it is granulate, with a marked median keel, indications of the 

 regions, and a very shallow notch between the hepatic and branchial regions. Front 

 with a median notch l^etween two slightly swollen projections ; its edge fringed with 

 hair, barely hiding mouth-frame. Fissures of orbit well marked. Of five spines in 

 hinder region of carapace all somewhat upcurved, median and laterals fairly slender, 

 intermediates little more than rectangular corners of hinder edge. Besides these, three 

 blunt spines on branchial and one on hepatic region. Exopodite of third maxilliped 

 about as wide as endopodite, its outer edge gently curved. All legs quite smooth 

 and unarmed. Chelipeds of male a little less than three times length of carapace, 

 fingers finely but irregularly toothed, gaping a little at l^ase, nearly as long as palm, 

 which is about one-third as wide again as wrist. Walking legs short, slender, about 

 one-fifth longer than arm of cheliped ; dactylopodite equal to propodite with about half 

 of carpopodite. 



Length of single (male) specimen, 24 mm. 



Placed in a bottle with Gecarcijius from South Trinidad Island, and therefore 

 probably taken near the island. Its condition somewhat suggests its having been 

 picked up dead on the shore. 



