350 Mr. F. O. P. Cambridge on the 
marginal portion lies a short, rather slender tooth, its apex 
directed inwards (PI. IV. fig. 1). 
A single female from the Museum collection, taken by 
Dr. Cuming at Manila, Philippines. 
(iv.) Genera and Species of 3-clawed Forms, with Notes on 
Types and Descriptions of New Species. 
1858-59. Dolomedes, Walck., Dolesch. Verhand. nat. Ver. Ned. Ind. v. 
p- 9. 
1884. Titurius, Sim. Ann. Mus. Genov. xx. p. 328. (Type 7. jimbriatus 
(Walck.), 2.—Cape of Good Hope, 8. Africa.) 
1885. Thalassius, Sim. Bull. Soc. Zool. Fr. p. 18. (For Ziturtus, nom. 
preoce.) 
1891. Dolopeus, Thor. Konel. Sv. Vet.-Akad. Handl. xxiv. (2) p. 60. 
(Type D. cinctus, Thor., 2.—Isl. Kamorta, Nicobar, Bay of Bengal.) 
Of the type of Thalassius, Sim., I know nothing, but I 
have been able to examine a specimen from South Africa 
(Umfali River) which undoubtedly belongs to this genus. 
The type of a species named Yhalassius unicolor by Simon 
himself, from Sheik Husein, is also before me, so that one 
can speak without hesitation on the characters of Thalassius, 
Sim. 
The species described below as Doleschallit and Simoni 
from Borneo are undoubtedly congeneric with Thalasstus 
wnicolor, Sim. ‘Three immature forms from Tenasserim and 
Tharrawaddy, Burmah (e coll. Oates), referred by Thorell to 
Thalassius albocinctus (Doles.), are identical with the form 
to which [I have given the name Doleschallit. I cannot 
regard it at present as possible to tell what form Doleschall’s 
albocinctus may have been. It is not at all likely that there 
is only one form with broad yellow-white bands found 
in Java, Borneo, and Burmah. I should fully expect four 
or five closely allied forms to be found on a more extended 
search. ‘Then it might be possible to identify albocinctus as 
that form which is found in Java exclusively, though even 
then there might be in this island itself two or three forms 
similar in general characters, differing only in the form of 
the vulva; and in this case the identity of albocinctus would 
be next to impossible to settle. I am confident that the 
absence of figures of these important structural points will in. 
future render a great deal of descriptive work almost useless. 
In the form described as 7. Stmoni the anterior central 
eyes are distinctly larger than the posterior centrals, and the 
clypeus is lower in proportion; but none the less I am 
