AUS MARINE BIOLOGY OF THE SUDANESE RED SEA. 
The possible identity of Actwa polyacantha (Hell., 1861) with A. peronit 
(H. M.-Edw., 1834) is a point requiring investigation. 
A study of certain growth-changes has been made in the 40 specimens of 
the common species Chlorodiella niger (Forsk.), as also in Trapezia cymedoce 
(Herbst), and less fully in Phymodius sculptus (A. M.-Edw.) and some 
others. 
Lupa aleocki (Nob., 1905), Herbstia corniculata, Klunz., 1906, and 
Macrophthalmus graefei, A. M.-Edw., 1873, have hitherto been known only 
by their type-specimens, and of each of the two latter species the present 
collection contains the first recorded male example. 
Caphyra monticellii, Nob., and Lupa alcocki (Nob.), are here figured for 
the first time. 
Other interesting forms in the collection include Nucia pulchella (A. M.- 
Edw.), Cyphocarcinus minutus, A. M.-Edw., and Thalamita (Thalamatoides) 
tridens, var. spinigera (Nob.). 
Workers on Red Sea Brachyura will find two publications indispensable 
as a starting-point, namely, Alcock’s ‘ Materials for a Carcinological Fauna 
of India’ and Nobili’s ‘ Faune Carcinologique de la Mer Rouge.’ Nobili 
records all species known from the Red Sea at the time of his writing 
in 1906. Klunzinger the same year published his ‘Spitz- und Spitz- 
mundkrabben des Roten Meeres,’ seen by Nobili when the latter had 
completed the body of his work, and reviewed briefly by him in an 
appendix. Klunzinger gives some useful descriptions and translations of 
some of Paulson’s Russian descriptions. He considers Acanthonyx conso- 
brinus of Paulson as a synonym of A. elongatus, Miers, so that A. consobrinus, 
A. M.-Edw., is to be deleted from Nobili’s enumeration, and he adds the 
following 7 species to the Red Sea fauna, namely, Simocarcinus camelus, 
Klunz., Herbstia corniculata, Klunz., Herbstia contiguicornis, Klunz., 
fTeterocrypta petrosa, Klunz., Parthenope acuta Klunz., Eumedonus convictor, 
Bouv. et Seu., and Hyastenus brockii, de Man, of which the first five were 
new to science. Including the 8 species added by the present paper, the 
revised list in Table I. shows a total of 260 species recorded from the 
Red Sea. 
The Red Sea Brachyuran fauna forms an integral part of the Brachyuran 
fauna of the Indo-Pacific region. To emphasize this, I have associated with 
the following complete list of Red Sea species a table showing to what 
extent they have been recorded in certain representative districts within the 
region. It will be noted from the headings of the columns that the records 
are exhaustive for some districts, while for others they refer to a single 
important collection from the district named. 
