428 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
Family LEUCOSIIDA. 
Genus Nucia, Dana, 1852. 
5. Nucta PuLcHELLA (A. Milne-Edwards, 1873). See Nobili, 1906, p. 163. 
Locality. Station V. A, 1 3 [10]. 
Remarks. C.1. 3 mm., C.b. 3°5 mm., frontal b. 1-1mm. Only two other 
examples of the species have been recorded. The present specimen is of the 
same size as that of Nobili from the Red Sea; A. Milne-Hdwards’s type- 
specimen from the Fiji Islands has C.]. 5°5 mm. and C.b. 6 mm. 
Genus PERSEPHONA, Leach, 1817. 
Includes Myra, Leach, 1817 ; teste Rathbun. 
6. PersEPHONA FUGAX (Fabricius, 1798). See Alcock, 1896, pp. 202 
and 204. 
Myra fugax, Alcock, loc. eit. p. 202. 
Myra pentacantha, n. sp.?, Alcock, lve. cit. p. 204. 
Myra fugax, Nobili, 1906, p. 164. 
Myra fugax, Klunzinger, 1906, p. 73, 
Myra fugax, Laurie, 1906, p. 360. 
Myra fugax, Stimpson, 1907, p. 152. 
Persephona fugax, Rathbun, 1911, p. 201. 
Locality. Station VIII. A, 1 2 juv. [11]. 
Remarks. ©.l. including posterior spine, 11 mm.; Ch.l. 19; mm.; 
Cl. = Ch.l.=1:73. The specimen appears to be a late pentacantha stage, 
the spine on either postero-lateral margin above the Jast pair of legs is 
slightly indicated. 
I agree with Nobili in believing that Persephona pentacantha, very doubt- 
fully created by Alcock, is in reality the young stage of Persephona fugax. 
Genus Lreucosia, Pubricius, 1798. 
The adoption of Leucosides, Rathbun, 1897, as a name for this genus 
depends upon one’s acceptance, with Rathbun, of Latreille’s examples of 
genera in 1810 as specifications of type (Rathbun, 1897, p. 160). I agree 
with Stebbing (Stebbing, 1902, p. 11, and 1908, p. 11) in not so accepting 
them. 
7. Leucosia signaTA, Paulson, 1875. See Klunzinger, 1906, p. 69. 
Leucosia signata, Nobili, 1906, pp. 163 and 544. 
Leucosia fuscomaculata, Klunzinger, loc, cat. 
Localities. Station II., 1 g [12]; Station VIII. A, 8 2 [13-20], 10 
[21-30]; Station VIL. D, 1 @ [31]. 
