SYSTEMATIC REPORT 157 



that in his material the males considerably outnumbered the females, and it is interesting to note that 

 in the captures made by 'Discovery', there are more than twice as many adult males as females. 

 Among the juvenile specimens there are more females than males, but there is not enough evidence 

 to show whether this has any significance or whether the females are less viable than the males. 



Distribution. M. schaltzei has hitherto only been known from near Angra Pequena and the present 

 records considerably extend its known geographical range to the southward. 



Mysidopsis similis (Zimmer) 191 2 

 (Fig. 38A-J) 



1912 Paramysidopsis similis Zimmer, p. 6, pi. II, figs. 28-36. 



Occurrence : 



St. 90. 10. vii. 26 (day). False Bay, Cape Town, 10-12 m., 4 SS, largest 10 mm., 2 ?$, larger 8-6 mm., with large 



brood sac. 

 St. 91. 8. ix. 26 (day). False Bay, Cape Town, 35 m., 1 6\ 7 mm., 1 juv. $. 



Remarks. The types of this species were captured with those of the preceding species in shallow 

 water near Angra Pequena. 1 



. The specimens in the Discovery material agree closely with Zimmer's figures and I find that, even 

 in the largest specimens, the spine row on the inner margin of the endopod of the uropod does not 

 extend as far as half the total length of the endopod (Fig. 38 H). Zimmer's figures are very small and 

 I give drawings of the most characteristic appendages of this species (Fig. 38A-H). 



Distribution. Besides the original record of this species from near Angra Pequena, I have 

 recorded it from shallow water in Saldanha Bay north of Cape Town and from Knysna Lagoon on the 

 south coast of South Africa. The two stations at which it was taken by ' Discovery ' lie within its 

 known geographical range, but its occurrence in 35 m. at station 91 is from considerably deeper water 

 than any other record. 



Mysidopsis major (Zimmer), 1912 



191 2 Paramysidopsis major Zimmer, p. 7, pi. II, figs. 37-49. 



Occurrence : 

 St. 90. 10. vii. 26 (day). False Bay, Cape Town, 10-12 m., 1 1 cJ6\ not adult, largest 11 -8 mm., 3 $$, largest 12 mm., 

 ovigerous, 4 juv. $$, 4 juv. 9$. 



Remarks. These specimens agree so closely with the description and figures given by Zimmer that 

 I have nothing to add. The species can readily be distinguished from M. schaltzei and M. similis, 

 with which it appears normally to live, by the broader, more rounded apex of the telson, by the very 

 long, acutely pointed rostrum and by the form of the spines arming the inner margin of the endopod 

 of the uropod. In M. schaltzei these spines are much larger than in the other two species and much 

 more spaced, especially towards the distal end of the endopod, and they extend right to the apex. 



1 While examining a small collection of mysids from estuarine waters of South Africa (O. S. Tattersall, 1952, p. 177), I 

 described and figured certain specimens from Langebaan Bay, to the north of Cape Town and from Knysna Lagoon on the 

 south coast of South Africa, referring them to a new species which I named Leptomysis tattersalli in memory of my late husband. 

 I then thought that the endopod of the first thoracic appendage was composed of the normal number of sub-segments and that 

 therefore the specimens must belong to the genus Leptomysis. Since examining the Discovery material, I have re-examined 

 these specimens and find that, in the endopods of the first thoracic appendages, the third and fourth segments are fused and 

 that they therefore belong to the genus Mysidopsis (Fig. 38 D). They agree closely with Zimmer's description and figures of 

 M. similis, except that the endopods of the uropods are longer than the telson and the row of spines arming their inner margins 

 is longer, extending almost to the level of the apex of the telson. I consider that they should be referred to M. similis and 

 I withdraw L. tattersalli as a synonym of that species. 



