of Recent Species r^ fjimulus. 263 



Tills species is commonly known as moluccanus, TititrcilK*, 

 1 ut the name heterodttctiflns^ jjroposed hy the same author, 

 stands first in his earliest work and has the priority. It 

 appears to me, however, that gifjns of Miiller as restricted 

 by Lamarck will liave to be adopted. Miiller contused two 

 species under Limulua (jiqns^ namely, the American and t!ie 

 ]\loluccan. Lamarck, following him, restricted the name 

 gi(]as to the Moluccan species, which he believed to be the 

 polifpheimis of Linna?us, naming the American s|)ocies occl- 

 dentah's (see Syst. Anim. sans Vert. i. p. 1G8, 1801 ; al«o 

 V. p. 147, 1818). 



From the description of L. LatreiUii it appears that the 

 type Leach had i)efore him had but one spine Uj)on t'le anal 

 einargination above and a groove along the lower side of the 

 ])Ostanal spine. These features coexist only in the species 

 known as vxoluccanus. 



Liviuhis vtrescena, Latreille (Gen. Crust, et Lis. i. p. 12, 

 1806), is, according to Milne-Edwards (Hist. Nat. Crust, iii. 

 p. 5-i8, 1840), e.xceedingly like L. moluccanus^ but the type 

 lias seven rounded conical and pointed sclerites at the base of 

 the penultimate segment of the sixth prosomatic appendage 

 instead of the four of the normal flattened form. This feature 

 is probably a case of abnormal development or of regrowth, 

 a supj)osition borne out by the further statement that the penul- 

 timate segment of the leg in question is extremely short. 

 tShould the character prove to be normal and of constant 

 occurrence, it must be regarded as the basis for a new genus. 



Dii,tiibutiun. T. giyas has a wide range. The Britislj 

 Museum has specimens from Malaysia ; Singapore {Ridlejy 

 Bedford, Lanchester) ; Gulf of Siam {S. S. Flower) ; Sara- 

 wak (C. Hose) ; Kudat {S. S. Flower) ; and Torres Straits 

 (J. B. Juices). 



Till ht/jdeus tridentfitus, Leach. 

 [Vl V. lig. E and PI. VI. fig. 2.) 



LinmluK trldeiitatus, Leach, Diet. Sci. Nat. xiv. p. V>7 (1819). 

 Liinulus lonijispina, \ au der IIoe\ en, llech. sur I'llist. nat. etc. dea 

 Limuhs, p. 32, pi. v. (LeyJen, 183dj. 



The type of L. tridentatus in the British Museum sliows 

 that this species was based upon a young of the Chinese ionn 

 that Van der Hoeven afterwards described as L. lonqispiua. 



JJii^tribution. This sj)ecies has a much more northern raiM'e 

 than T. gigcis, extending to the coast of China and Southern 

 Japan. Southwards it overlaps the area of T. ginas. 

 Examples of both .-species, for instance, have been received 

 by the British Museum from Kudat, in British North 



