Dr. Strahl on new Thalassine from the Philippines. 383 
XLII.—On some new Thalassine sent from the Philippines by 
M. Jagor, and on the Systematic Position of that Family. By 
Dr. Strauy*. 
Scytoleptus serripes, Gerstiicker. 
Tuts genus and the single species known to belong to it were 
established by Gerstiicker from a single mature female specimen. 
This specimen is from South Africa. M. Jagor has sent a male 
specimen of this species from Luzon, together with other Tha- 
lassine and Alphei. The Zoological Museum of Berlin possesses 
four more Scytolepti brought from Mozambique by Prof. Peters; 
these also belong to the same species, and two of them are male 
and two female. From these materials it becomes possible to 
obtain a more accurate notion of the organization of this genus. 
The male individuals are smaller than the females. The 
cephalothorax of the male from Luzon measures 5 lines (Parist) 
in length, the abdomen 10°5 lines, and the tail-fin 2 lines; this 
gives a total length of 17:5 lines. One of the males from 
Mozambique has the cephalothorax 8 lines, the abdomen 7, and 
the tail-fin 3 lines in length, giving a total length of 18 lines ; 
whilst the largest mature females measure more than 2 inches 
up to nearly 24 inches in length. The tail-fin is always very 
long; in one female from Mozambique it is 5 lines in length, 
whilst the abdomen measures ]1 lines. The chelee of the first 
pair are unequal in this genus, the right one being usually the 
stronger; in a male from Mozambique this character is, how- 
ever, reversed. The fifth pair of feet has no branchie; the 
branchize on the others are leaflike. 
Callianassa mucronata, n. sp. 
Of this species I have unfortunately only one specimen at my 
disposal ; and this is a female, of the maturity of which I am not 
sure, as there were no eggs under its abdomen. From the ex- 
treme projecting point of the forehead to the apex of the tail it 
measures 13 lines. Although it may be a young state, still it 
shows such differences that it is certainly a new species. Above 
all things, the forehead is furnished with a small point project- 
ing between the eye-peduncles to about half the length of the 
latter. This frontal point is smooth above, and not compressed 
at the sides. On account of this frontal point, which does not 
occur in any other known Callianassa, I have named the species 
mucronata. 
The eye-peduncles are, as usual in the Callianasse, vertically 
* From the Monatsbericht der Berl. Akad. December 1861, p. 1055. 
Translated by W. S. Dallas, F.L.S. 
+ Throughout this paper the measurements are in Paris lines. 
