6o DISCOVERY REPORTS 



Diam. 4-5 mm., height 5-5 mm. (St. 102). Gonads a little above the middle of the canals, two of them, on adjacent 

 canals, fairly large, pendent, with small eggs, the others like small dots. 7-8 tentacles per octant. 



Diam. ?, height 5-5 mm. (St. 1575). Gonads in the middle of the canals, mutilated. About 10 tentacles per 

 octant. Bell margin comparatively well preserved, but statocysts lost. 



Diam. 7 mm., height 8 mm. (St. 89). Only four of the gonads are developed; they are small, arranged crosswise 

 on the radial canals alternating with the sterile canals. The tentacles cannot be counted. 



These details show that the development of the gonads proceeds irregularly; in small as well as 

 large specimens only four gonads may be developed, and when there are eight in different stages of 

 development, they are irregularly arranged. 



This species differs from Amphogona apsteini by the higher form of the umbrella, the possession 

 of a distinct apical knob, and particularly by the position of the gonads in the middle parts of the 

 radial canals, whereas the gonads of A. apsteini are placed very near the ring-canal. A. pusilla Hartlaub 

 has only 16 tentacles. 



Distribution. Bathypelagic in the neighbourhood of the Falkland Islands and South Georgia, 

 west of the Cape of Good Hope, and in the Mozambique Channel. 



Tetrorchis erythrogaster Bigelow 1909 



1909 Tetrorchis erythrogaster Bigelow, p. 124. PI. 29, figs. 1-3. 

 1936 Tetrorchis erythrogaster Thiel, p. 39. 



Occurrence: St. 1598. 23.x. 35. 07° 10' 48" S, 03° 31' 18" W. Gulf of Guinea. Net: TYFB 460-300 m. i specimen. 

 St. 2036. 17. iv. 37. 33° 45' 30" S, 15° 03' 48" E. West of Cape of Good Hope. Net: TYFB 2650-2200 m. 

 I specimen. 



The specimen from St. 1598 is badly preserved, but the margin is in a fair condition with 4 large 

 and 16 small tentacles. The specimen from St. 2036 is 8 mm. in diameter, 7 mm. in height, and agrees 

 well with Bigelow's description. The four gonads, however, are situated a little higher, in about the 

 middle part of the radial canals. The distal quarter of the manubrium extends beyond the bell cavity. 

 There are 4 large tentacles opposite the fertile radial canals; 16 very small tentacles are arranged at 

 almost equal distances from each other, none of them are situated opposite to the sterile radial canals. 

 According to Bigelow the sterile canals 'can hardly be traced at all as they approach the ring-canal'; 

 in the present specimen they are distinct right out to the ring-canal. Like Bigelow I cannot see the 

 statocysts. According to a note on the label the manubrium was 'a lovely purple red'. 



Distribution. This characteristic species was originally described from the tropical East Pacific; 

 Thiel records a specimen from the tropical Atlantic near Cape Verde. The present specimens were 

 taken farther south, off the west coast of Africa. The species belongs to the deep and intermediate 

 layers. 



Persa incolorata McCrady 1857 



1857 Persa incolorata McCrady, p. 104. PI. 12, fig. 3. 



1910 Persa incolorata Mayer, p. 408. Text-figs. 261-2. 

 1936 Persa incolorata Thiel, p. 43. 



195 1 Persa incolorata Picard, p. 20, fig. 



Occurrence: St. 282. 12. viii. 27. 01° 11' S, 05° 38' E. Gulf of Guinea. Net: TYF 30o(-o) m. 3 specimens. 

 The best preserved specimen is 2 mm. in diameter, 2-5 mm. high, with very thin walls and a small 

 apical knob. There is a very short, conical gastric peduncle. The stomach is short, turned inside out, 

 the four short, broadly rounded lips therefore protruding from its upper part. The musculature of 

 the subumbrella is fairly strong. The eight radial canals are very narrow, and each of two opposite 

 canals carries a short, oval gonad in its middle portion. The gonads are connected with the canals 



