224 discovery reports 



Pasiphaeidae 

 Pasiphaea semispina Holthuis 



Holthuis, 1951, p. 9; 1952, p. 26. 

 Occurrence. St. WS 987, 50-0 m., 3 specimens, c. 35-40 mm. long; 250-100 m., 1 specimen, 

 c. 45 mm. long, in berry. 



This species was described from a single male of 66 mm. by Holthuis (1951) from off Angola 

 (7° 35' S -> I2 ° 3 8 ' E > 2 35~4 6 ° m - depth, bottom mud, 17. iii. 46). Later, Holthuis (1952) recorded 

 several more specimens, including females, from the South Atlantic. These records range from 

 5 52' S., ii° 43' 30" E. to io° 45' S., 13 E., therefore all came from much farther north than the 

 'William Scoresby's', which were collected between 20 and 26 S., thus greatly extending the known 

 range of the species. The ' William Scoresby ' specimens came from depths of 50-0 to 250-100 m. and 

 were 35-45 mm. long; Holthuis's from 74-500 m. and measured up to 70 mm. in length. The species 

 apparently does not inhabit great depths. 



A young pasiphaeid, 7 mm. in length, occurred at St. WS 979, 100-50 m. It is almost certain that 

 it belongs to this species for the spines on the fourth and sixth abdominal somites are beginning to 

 show, the rostrum and appendages are similar and the merus of the first and second legs have no 

 spines. The sixth abdominal somite is very long, a good deal longer than the fourth and fifth combined, 

 but it frequently happens in decapod larvae that the length of this somite is longer in the young than 

 in the adult. It seems likely that there are only a few stages between this and the newly hatched 

 larva. The telson bears eight setae at its end but is slightly concave instead of convex at the margin. 



HlPPOLYTIDAE 



Several larvae are present but it is difficult to place the young stages, most of which resemble Hippolyte 

 or Eualus. One first stage differs in having a distinct hump on the third abdominal somite and a very 

 much elongated telson, and this may not be an Hippolytid at all (St. WS 1001, 50-0 m.). 



Two Hippolytid larvae indet., cf. Eualus (St. WS 979, 50-0 m.) and one Hippolytid larva indet. 

 (St. WS 979, 100-50 m.) are at stage I, with humps on the third abdominal somite and a long 

 telson, as is the larva from St. WS 1001 (50-0 m.). 



One Hippolytid post-larva, possibly Eualus lebourae, was described by Holthuis (1951) from West 

 Africa. This is not unlike the post-larval stage of E. occulta (Lebour, 1936a). It is possible that the 

 larva from St. WS 1001 may be a first young stage of this species {occulta) as the exopods have 

 disappeared from the legs. There are two dorsal teeth on the rostrum, the telson has three pairs of 

 dorso-lateral spines and three pairs at the end which is pointed. The second leg is incompletely 

 segmented but there are three distinct divisions and an indefinite number (possibly four) not properly 

 formed. The antennule is like that of E. lebourae but more elongated. 



Three Hippolytid larvae, stages II-IV, possibly Eualus, occurred at St. WS 1002, 50-0 m. 



Processidae 

 Occurrence. St. WS 979, 50-0 m. 1 Processa larva, stage VIII or IX. St. WS 979, 100-50 m. 

 1 Processa larva, stage IV or V. 



These larvae are of the Processa edulis type with no dorso-lateral spines on the fourth abdominal 

 somite (Lebour, 19366). Holthuis (195 1) describes several new species of Processa from the East 

 Atlantic, not far from the present region. His P. intermedins seems to be the closest to P. edulis. 



