obtained in the Indian Seas. 2G7 



Miilc. 

 mm. 



L-cngtli of carapace, includinj,^ front ** 



„ „ alone Tf 



Hieatest Ineadth of carapace 11 



Leiijj-th of hand 7^ 



Orbits are incomplete; tlicir inferior border is formed l)y 

 tlie basal joint of tlie antenuule, that of tlie antenna, and tbc 

 infraorbital spine. A vertical antero-posterior plane throuj^h 

 the supraorbital si)ine passes between the basal joint of the 

 antenna and the infraorbital spine. Eye-stalks arc short 

 and conical ; the cornea (small and hemispherical) is placed 

 obliquely (looking outwards) on the summit of the eye-stalk. 

 The basal joint of the antennule is hugely inflated, globular, 

 freely mobile, and with a finely granular surface; second 

 and third joints cylindrical and comparatively slender, fold 

 transversely on the swollen basal joint. The antennse arise 

 on the same level with and between antennule and infraorbital 

 spine, and the flagellum is about half the length of the 

 carapace. 



The e^'es, second joint of antennule, and the inflated basal 

 antennule joint all extend outwards and reach about the 

 same distance. This is a specific character of this new 

 species. In P. notopus the eyes extend outwards as far as 

 the infraorbital spine, and the second antennule joint also 

 extends well beyond the inflated basal joint and reaches the 

 basal joint of the antenna. 



Epistome is linear ; buccal cavity is wider in front than 

 behind. Eflereut branchial channels are well defined, 

 ])atulous, and produced anteriorly. External maxillipcds are 

 subpcdiforni and leave uncovered the greater part of the 

 underlying mouth-parts ; the palp arises from the aj^px of 

 the small oval merus ; merus and ischium have a fiuely 

 granular surface. 



Chelipeds are unsymmetrical in the male ; both are about 

 the same length, but the right is thicker in all its joints. 

 13oth l.'ands are also of equal length, but they difler in the 

 relative lengths of palm and fingers ; the right hand has not 

 only a stouter but also a slightly longer palm than the left, 

 but the latter makes up the difference by having longer 

 fingers. The length of the hand, which equals that of the 

 remaining part of the cheliped minus the wrist, is very 

 slightly less than the length of the carapace. The smaller 

 palm is compressed, the larger inflated. Eingers are longer 

 than palm, compressed, acute, curved, and slightly excavated 

 on the inner surface. The fingers of the smaller hand are 



