69 



we find the very first indications of tentilla as small elongate buds, placed closely one next to 

 the other. (PI. XI, fig. 88). 



These young tentilla are very much clearer in the second and last tentacle, which is 

 situated about lo mm. from its predecessor also at the base of an incomplete siphon, of which 

 again only the basal part, the strongly muscular wall has remained. 



This tentacle is broader, whiter and larger than the younger one and shows better 

 the segmental incisions. Some of its tentilla are situated on the other side, others we detached 

 ourselves to get a clearer idea of their structure. The tentacle with the remaining tentilla is 

 sketched on PI. XI, fig. 88; the specimen has been turned upwards somewhat to make the 

 tentilla stand out more clearly. We now distinguish on the left side of this drawing the most 

 mature tentillum which reminds one at once of the tentilla described by Bedot. Another, larger 

 one, is sketched on PI. XI, fig. 89. They recall Bedot's figures. It is as in the tentilla of Bedot's 

 Erenna Richardi divided into a pedicle (PL XI, fig. 89 pti.), a middle part {inpti.) of which 

 the upper half consists of the black-granulated "appareil urticant" [cpti.), and the apex (apti.), 

 in which Bedot, moreover, found a strange apparatus, two paired ocelli ("organes de I'appendice 

 terminal"); these are only just beginning their development as a small black spot situated 

 near the apex, but we find it more in the neighbourhood of the crest than of the apex of the 

 tentillum. This shows probably that the tentillum is not a full-grown one. The "bourrelet de 

 nematocystes" in Bedot's Erenna Richardi is the proximal part of the granulated crest, which 

 does not stand in connection with the entodermal canal of the middle-part. In our largest 

 tentillum we find it on the contrary near the basal part: near the peduncle of the tentillum. 

 Perhaps such another "bourrelet" is being- developed in later stages. 



Microscopical sections have been made but the material is unfortunately absolutely insuf- 

 ficient, the different layers being all destroyed. We can therefore give no further description of 

 the very interesting entodermal canals and paired organs which Bedot describes, nor of the 

 "cellules transparentes" and the relation all these layers bear one to another. 



However incomplete the description of these tentilla is, there exists undeniably the closest 

 relationship between the tentacles and tentilla of Erenna Richardi and Erenna Bcdoti. The 

 resemblance of the tentacles of these two to those in the new species, Bathyphysa Sibogae, is 

 also a striking one (compare PI. XI, fig. 88 and PI. XXIII, fig. 163). Finally we give as ketch 

 of a mature bract, which whilst examining the specimen, became detached. It has a length of 

 18 mm., a breadth of 2^^ mm. (PI. XI, fig. 90). It can be divided into two distinct parts, the 

 basal one which is excavated and rounded anteriorly, the proximal one which arises somewhat 

 higher and finishes gradually in a blunt point. This second part shows a small indentation which 

 is probably also situated on the other side, but was lost. The cartilaginous substance is not 

 very consistent, there are no ridges, nor is any part of the bract serrated. The canal of the 

 bract goes right through the median part of the gelatinous substance. 



