10 



The 8rd (longest) chelipeds usually reacli, in the adult, nearly to the tip 

 of the antennal scale; but their length varies somewhat according to sex 

 and age. 



In the 1st and 2nd chelipeds the ventral border of the basis is produced 

 into an antrorse spine; and in the 1st alone the same border of the ischium is 

 similarly but less acutely produced. 



All the thoracic legs have an exopodite. 



The "petasma," or "andricum," is symmetrical: it consists of two simple 

 lobes which by their apposition form a sort of tube : the lobes (in the adult) 

 are united all along their anterior (upper) edge by microscopic booklets, and 

 each lobe is deeply channelled and is strengthened all along its posterior (lower) 

 edge by a strongly-calcified S-shaped rib. 



Tne "thelycum" is rudely oval and consists of two lobes, the inner 

 (opposed) edges of which are more or less raised. 



This species grows to a length of over 9 inches. 



The collection contains 44 specimens registered under the following 

 numbers : — 



Orissa and Ganjam, 20-33 fathoms. ' 

 Ofi Indus Delta, 30-72 fathoms. 

 G. of Martaban, 20 fathoms. 

 Ofi Pulicat (Madras). 

 Madras and Pondichery. 



[ 



!- 



J 



' Investigator." 



Purchased. 



Su€ 



J. Wood-Maso: 



-3 



2. Peneus semistjlcatus, DeHaan. Plate I., fig. 2. 



Penwiis semisulcntus, De Haan, Pann. Japon. Crnst., p. 191, pi. xlvi. fig. 1, 1849: Stimpson, Proc. Ac. Philad. 

 1860, p. 44 : Hellfir, Novara Crust., p. 121, 1865: Miers, P.Z.S. 1S78, p. 299 (part.): Haswoll, P.L.S., N. S. Wales, 

 1879, p. 38, and Cat. Austral. Crust., 1882, p. 199 : de Man, Notes Leyden Mus. II. 1880, p. 185, and Jonrn, Linn. 

 Soc, Zool., XXII. 1888, p. 284, and in Max Weber's Zool. Ergebn. Niederl. Oet-Ind. II. 1892, p. 510, and Zool. 

 Jahrb., Syat. etc., X. 1898, p. 677 : Ortmann, Zool. Jahrb., Syst., V. 1890, p. 450 (part.) : Nobili, Ann. Mus. Civ. 

 Genov. (2) XX. 1899, p. 232, and 1900, p. 474: Lancliester, P.Z.S. 1901, II. p. 570: Dofleiii, Abh. Ak. Jluiichen, 

 1902, p. 630. 



? Penxus semisulcatus var exsiUcatus, Hilgendorf, MB. k. Akad. Berlin, 1878, p. 843. 



JTenieus tahitensis, Heller, Novara Crust., pi. xi. fig. 2, 18C5. 



Penasus monodon, Kishinouye, Journ. Fish. Bur. Tokyo, VIII. i. 1900, pp. 7, 15, pi. ii. fig. 1, pi. vii. fig. 3, 3o. 



The P. monodon of many authors includes this species, which strongly 

 resembles P. monodon Fabr., but is distinguished by the following specific 

 characters : — 



