466 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
appearance ; the tip of the fixed finger is pointed and curved and lies against 
the outer side of the more strongly curved tip of the dactylus; dactylus about 
three-quarters as long again as the upper border of the propus (1°71 upper 
border propus), its tip very strongly curved—at the base of its apposed border 
is a large triangular tooth and a smaller one on the distal half of the same 
border corresponding to a similarly placed one on the fixed finger; the 
fingers meet only at their tips, which cross as above indicated, the consider- 
able gape being occupied by fine downy hairs. The whole cheliped, more 
particularly the inner surface of the hand, is covered with fine down. 
The first three walking-legs are of equal length and each is a little shorter 
than the cheliped and 1°48 C.l.; W.L. 4 is shorter (1°3 C.l.). The dactyli 
of W.L. 1, 2, and 3 are equal in length (0°23 C.l.), that of W.L. 4 is longer 
(0°28 C.l.), but of very similar form. 
Some measurements of the specimen are as follows :—C.1. 6 mm. ; C.b. 
6 mm.; Ch.l. 9°5 mm. ; lower bord. propus Ch. 1°75 mm.; Fl. 3-1 mm. ; 
W.L. 1, 2, and 3 are each 8:9 mm.; W.L. 4 is 7°35 mm.; dactylus 1. of 
W.L. 4 is 1:7 mm. 
It will be noted that in Nobili’s key of Ostracotheres the place of O. cynthie 
is determined by characters of the ¢ ; the key is of doubtful value in identi- 
fying a ¢ example. 
Nobili does not figure the species, save for a text-figure of part of the third 
maxillipede (sex not stated). 
As Nobili’s reference to the ¢ is not very precise, and his description and 
figure of the propodite of the external maxillipede do not agree with mine, it 
is just possible that the present specimen represents a new species; should 
this be so, the almost circular carapace and the form of the propodite of the 
external maxillipede are characters to be noted more especially. 
Genus PInNoTHERES, Bosc, 1802. 
Original orthography Pimnotheres, not Pinnoteres. 
57. PINNOTHERES PILUMNOIDES, Nobili, 1905. See Nobili, 1906, p. 307, 
fig. 12. 
Pinnoteres pilumnoides, Nobili, loc. eit. 
Localities. No locality given, labelled “Trials I., mostly from sponge,” 
19 adult non-ovig. [387]; no locality given, labelled “From Holothuria 
gallensis,” 2 ? ovig. [388, 359]. 
Remarks. 
© 387. O ov. 388. 9 ov. 389. 
Clie ac Geoettendate ye 10:0 10:0 12:25 mm. 
Obey bole each eee oe 11:0 11:5 14:25 mm. 
Post. Abosd.i@, erates iors 4:0 5:0 6:0 mm. 
(ORIN EAC OF URIS perio sich cocto lsat “Ol ‘87 ‘86 
Post. vord, C-=-Cib. ai seas ‘36 "43 “49 
