300 DISCOVERY REPORTS 



Genus Caprella, Lam. 

 Mayer, 1903, pp. 14, 72. 



Caprella equilibra, Say. 



Mayer, 1903, p. 89, pi. iii, figs. 29-34; P'- v "> % s - 66-69 (aequilibra). 

 Occurrence: St. 34 23' N, 14 32' W. 3 <3<$ 5-8 mm., 1 $with embryos 7 mm., 1 immat. ? 6 mm. 

 Distribution. Widely distributed. 



Caprella acutifrons, Latr. 



Mayer, 1903, p. 79, pi. iii, figs. 4-28; pi. vii, figs. 62-65 (references). 

 Stebbing, 1910 a, p. 465 {penantis). 



Occurrence : St. 4. Tristan da Cunha. Many, $<$ up to 1 1 mm., $$ up to 6 mm., incl. many ovig., 

 with embryos, and juv. 



Remarks. The S3 have the "poison tooth" of gnathopod 2 proximal and resemble 

 vars. natalensis and porcellio. The tooth varies in size and may be straight or crooked, 

 so there seems little use in keeping the two varieties separate. 



Distribution. Widely distributed, including Magellan Strait and the Brazilian 

 coast. 



Genus Pseudaeginella, Mayer. 

 Mayer, 1890, p. 37. 



Hitherto regarded as a monotypic genus recorded from Tristan da Cunha and 

 Antigua, W.I. For the form from the latter locality, however, a new name is here 

 proposed. 



Pseudaeginella tristanensis (Stebb.) (Fig. 166). 

 Stebbing, 1888, p. 1249, pi. cxliii. 

 Mayer, 1890, p. 37, pi. v, fig. 51 ; pi. vi, fig. 14. 

 Non Stebbing, 1895 {Ann. Mag. Nat. Hist. (6), xv), p. 397. 

 Non Mayer, 1903, p. 59. 



Occurrence: St. 4. Tristan da Cunha. 1 $ 4-5 mm., 1 $ (brood pouch empty) 4-5 mm. 



Fig. 166. Pseudaeginella tristanensis (Stebb.). General view of (J. 



Remarks. These two specimens taken in the same locality as Stebbing's original 

 specimen may with good reason be assumed to represent the adult form. Possibly the 

 present $ is not fully adult, as it is no bigger than the $, and the hand of gnathopod 2 

 might be expected to show a more pronounced difference from that of the ?. 



