9 ■ 9 ■ 9 

 3920-22 

 9 



4481 4487-90 



9 ' 9 

 4482-86 



Iiivestic'atoi'." 



22 



The tlielycum consists of a broad concave median tongue, not embraced by 

 any lateral processes of the penultimate thoracic sternum, but more or less en- 

 sheathed posteriorly in a salient horse-shoe-shaped process formed by union of 

 the lateral lobes of the organ itself. 



This species rarely exceeds 4^ inches in length. It is common all along, 

 the east coast, from Orissa to Vizagapatam, where in one season I collected near- 

 ly 100 specimens; and it has also been taken at Coconada, Madras, Colombo, 

 and off the Malabar coast. 



Nobili, who records this species from Pondichery and Mahe, has already 

 remarked that the 5th pair of legs may be properly developed in the female. 

 This author is probably righ in considering- their usual stump-like condition to 

 be a phase of regeneration after loss; but whether the loss is accidental, or is 

 normal to the reproductive process, is a question to be asked. 



The Museum possesses 126 specimens, registered under the following num- 

 bers : — 



3917 



— -— 9 CoTYPE. itanpalore (Malabar coast). I'ritish Musenin. 



3918 ,5070-74 5919 ,, . ^,. , ,, , 



LTanjani : Vizagapatam : t ocoriada. 



Orissa I'oast. 



Madras. Purchased. 



Coliimbo. J. Anderson. 



9 



• 4. Metapeneus r.REVicORNis, Edw. Plate lY., fig. 10, lOa, b. 



Pemi'iia brevicorTiinj Milne Edwards, Biat. Nat. Crust. II. p. 417, 1837 : Hichters, in Mobius, Meeresf. Manrit. 

 ISSO, p. 166 : Spence Bate, Ann. Mag. Nat. Hist. (5j VIII. 1881, p. 180, pi. xi fig. 3 : Henderson, 'I'rans. Linn. 

 Soc. (2) V. 1893, p. 450 : de Man, Zool. Jahrb., Syst., X. 1897, p. 681 : Lanchester, P.Z.S., 1901, II. p. 571. 



Penwus «tiVo.v(n'.s-, Dana, U.S. Expl., Exp., Crust., pt. I. p. 603. pi. xl. fifi. 3, 1852: Heller, Novara Crust. 

 p. 123, 1865 : Miera, Ann. Mag. Nat. Hist. (5) V. 1«80, p. 457. 



Pemens sp., Lanchester, t.c p. 571, pi. ixxiv. tig. 7. 



Metapenwus nvirosfris, Nobili, Boll. Mus. Torino, 1903, No. 447, p. 2. 



Compared v/ith ilf. monoceros this species shows the following difference : — 

 It is not, or very little, tomentose. The rostrum is curved and rarely 

 reaches to the middle of the 2nd joint of the antennular peduncle, sometimes 

 only iust surpassing the eyes : dorsally it bears 7 teeth, which form a decided 

 crest. The post-rostral crest, however, is very indistinct, and only just reaches 

 into the posterior third of the carapace. The post-antennular (antennal) spine 

 is weak and is not continued as a well-cut post-antennular ridge, so that the 

 post-antennular gi-oove is shallow. The hepatic spine is very small. The sub- 

 hepatic groove (anterior i)art of cervical gi-oove) which defines the branchial 

 region anteriorly, is shallow and does not meet the hepatic spine. The ridge 



