STALK-EYED CRUSTACEA 491 



three solitary spines on the posterior margin. The 

 seventh joint is short, curved, and terminates in a curved 

 bifid nail, both points being sharp. 



The telson is shorter than the lateral wing of the 

 swimming organ ; it has two spines on the upper surface, 

 and a long and a shorter one on the margin on each side 

 of the terminal extremity. 



Range. — Bermuda ; shallow water. 



Family IV. Nematocarcinidas, 



Ncjnatocarcinidci; .... Spence Bate. 



Animal smooth and slender. Internal antennae with 

 two long slender flagella. External antenna; have a long 

 and narrow basal scale, and a long slender flagellum. 

 Mandibles have a palp. The legs have a fifth joint much 

 longer than the sixth. The first two pairs, long and 

 slender, have pincers. Telson slender and tapering. 



I. Nematocarcinus. 



Neviatocarcinits . A. Milne Edwards, Spence Bate. 



Rostrum laterally compressed, toothed above, smooth 

 below, or at most armed with very small teeth. Frontal 

 margin of the carapace has one tooth on a level with the 

 internal antennse, and a second tooth at the fronto-lateral 

 angle. Eye-stalk short ; eyes globular. The internal 

 antennae have the first joint deeply excavate, and 

 furnished with an external spine ; the second and third 

 joint short and robust ; outer flagellum is stout near the 

 base. The mandibles have a cutting edge and a molar 

 process, and carry a two-jointed palp. The first maxilli- 

 pede has the terminal joints reflexed, and carries a long 

 external appendage. The external maxillipede terminates 



