South African Crustacea. 255 



FAMILY HOMOLIDAE. 



(See South African Crustacea, pt. 2, p. 20, 1902 [in Gilchrist's 

 Marine Investigations in South Africa].) 



GEN. LATEEILLOPSIS, Henderson. 



1888. Latreillopsis, Henderson, Rep. Voy. Challenger, vol. 27, pt. 69, 



p. 21. 



1912. Ihle, Tijdschr. Ned. Dierk. Vereen., ser. 2, vol. 12, 



p. 211. 



1913. Ihle, Siboga-Exp., Mou. 396, p. 77. 



Carapace rectangular, with a median spiniform rostrum and a 

 supra- orbital spine on each side. Ocular peduncles with the 

 basal segment narrow, cylindrical, elongate. First and second 

 antennae and third maxillipeds similar to those in Homola. 

 Chelipeds of female slender, shorter than second, third, or 

 fourth peraeopods. Fifth peraeopods subchelate. Pleon of 

 female seven-jointed, broad, but with narrow triangular telson. 



LATREILLOPSIS ALCOCKI, n. sp. 

 Plate CIV. 



From the type-species, the little Latreillopsis bispinosa, Henderson, 

 the present form is distinguished at first sight by its far greater size, 

 and, apart from that sometimes untrustworthy distinction, by various 

 details of structure in regard to the second antennae and the limbs. 



The acute rostral spine is here inconspicuous in dorsal view by reason 

 of its depression, although the pair of larger flanking spines ascending 

 obliquely to the rear do not interfere with it, as they are wide apart. 

 Each of the three is attended by a subsidiary tooth at some distance 

 from its base. The gastric region is armed to the rear by a strong 

 upright tooth, preceded by a row of four smaller teeth in a curved line 

 between it and the teeth behind the eyes. Various small teeth or 

 spines stud the carapace and numerous strong teeth project from the 

 descending sides. The length of the carapace is 45 rnm. The 

 distance between the apices of the spines against which the eyes 

 rest is 18 mm. ; behind the neck the breadth widens to 32 mm. 

 between the tips of the lateral spines, the greatest breadth, 44 mm., 

 being reached at a distance of 28 mm. from the apex of the rostrum. 

 A small central spine is observable on each of the first four segments 

 of the pleou, and a very small one on the distal end of the sixth. 



