50 EDWARD T. BROWNE. 



groups is as follows : 3 large + 1 small, 2 1. + 2 s., 2 1. + 2 s., 2 1. + 2 s., 2 1. + 2 s., 

 2 1. + 1 s., 3 1., 1 1. + 1 s. The large tentacles are 4 to 5 mm. thick near the base, 

 and one measured 260 mm. in length. The small tentacles are in the course of 

 development ; they vary very much in size and length, and are situated on the outer 

 sides of the group. Some of these little tentacles are only just visible, and measure 

 about 2 mm. in length. The gonads protrude about 30 mm., and the genital openings 

 in the wall of the stomach are 20 to 25 mm. in width and 35 to 40 mm. in length, 

 and the spaces between the openings about 8 mm. 



Specimen C. This specimen is in better condition than the other two, but it is 

 by no means perfect. The diameter of the umbrella, measured to the periphery of the 

 circular muscles, 'is about 220 mm. The umbrella is of moderate thickness and its 

 external surface is smooth and free from warts or clusters of nematocysts. 



The stomach is circular in outline, about 80 mm. in diameter, with sixteen radial 

 pouches. The tentacular pouches are 45 to 55 mm. in width at their distal margin, 

 and the rhopaliar pouches about 35 mm. The oral arms are incomplete, only the 

 basal parts remain, and these have large frills. The width of the pillars of the arms 

 is about 10 mm. The gonads in general appearance are similar to those of Desmonema 

 chierchianum, and are about 70 mm. in length. The genital openings are large and 

 somewhat rectangular in shape and measure about 40 mm. in length and 30 mm. 

 in width. 



There are eight groups of tentacles arranged in a single row, adjacent to the 

 outer edge of the circular muscles. The largest tentacles are in the middle of the 

 group and the smallest on either side. The large tentacles are broken off close 

 to the umbrella, and stumps show that they were about 5 mm. in thickness. In 

 each group there are two or three large tentacles and two that are smaller. 

 The sense organs are eight in number and are very much like those in Desmonema 

 chierchianum. 



The tentacular lobes (PI. V., fig. 1) measure about 45 mm. in length and 55 mm. 

 in width, and their distal margin is without any clefts or indentations. The rhopaliar 

 lobes are about 35 mm. in length and 25 mm. in width. The canal system in the 

 marginal lobes is of the same type as that in Desmonema chierchianum (PL V., fig. 2). 

 In the tentacular lobes there is a canal between every two tentacles. Owing to the 

 fewness of the tentacles in Desmonema gaudichaudi the canals are also few in number, 

 but they are much broader than in Desmonema chierchianum, and occasionally nearly 

 coalesce in the proximal part of the lobes. 



The young Medora stage of Desmonema chierchianum described by Dr. Vanhoffen 

 (1908, p. 46, Taf. II., fig. 3) and taken at the 'Gauss' Winter Station, I consider to 

 be a young Desmonema gandichaudi Maas. It measures 38 mm. in diameter, with 

 eight groups of tentacles, each group containing one large stout tentacle and one 

 minute tentacle or tentacular bud. In the Report on the ' Scotia' Medusae I described 

 young stages of Desmonema chierchianum from the Falkland Islands. One specimen, 



