ii6 



siphon (PI. XXIII, ii^. 163). The tentacle has a length of 13 mm., and is articulate, every 

 segment showinsj a convex and a flattened side, all beino- connected tofjether bv a band, a 

 strongly muscular, at the same time, absolutely transparent cord. Between two segments, a 

 tentillum is attached on the internode, of which a strongly magnified view after staining with 

 alum carmine and orange G is seen on PI. XXIII, fig. 164. It is the largest and oldest tentillum 

 which was found on the specimen and the same which is figured on PI. XXIII, fig. 163. The 

 drawing of this tentillum shows the development of an elongate terminal filament and two side 

 ones; owing to the small size of the latter, Ave suppose that even this tentillum has not reached 

 its definite size ; the presence of only a small quantity of cnidocysts (yellow-coloured spherical) 

 makes it probable we have reason to believe so. In the sketch the entoderm is black. We 

 suppose that the lighter coloured grey ectoderm has been lost at the apex, probably through 

 explosion of many cnidocysts. 



Up to this time tentilla of BatJiyphysidae have not yet been described. A general 

 resemblance to those of Rhizophysa filiformis Forsk. is not deniable, whilst there is also 

 much similarity in the mode of attachment of the tentilla and in the shape of the tentacle to 

 Erenna Bedoti (see p. 68) and Bedot's Erenna Richardi. 



Another mature siphon (47 mm. distance tVom the first number 23) shows absolutely 

 the same structure as the siphon of the 21*' group. The pedicle has a length ot 2 cm., the 

 tentacle and its tentilla (the latter shows only younger ones than those of the 21''^ siphonj are 

 of the same structure. Between these two siphons another notch on the stem shows that here 

 again a siphon (22), and a gonostyle have become detached. So the second mature siphon 

 probably belongs to the 23^^ group of appendages. 



The remaining part of the stem, 18 cm. distant from the last siphon mentioned above, 

 shows no more appendages. It is very irregular in shape, sometimes narrow, sometimes broad 

 and bears here and there small branches, the stalks of detached siphons. 



Cat. 2'j (PI. XX, fig. 148, PI. XXI\\ fig. 173) we also called Bathyphysa Sibogae as in 

 the oldest siphons the stalk, although small, could be distinguished together with a tentacle with 

 immature tentilla at the base of these siphons. 



Cat. 27 has a length of only 10 cm. and all its appendages are accordingly of small size. 



The pneumatophore has a length of 6 mm., it is pear-shaped and attains its greatest 

 breadth at its base (2,5 mm.). It is clearly marked off from the stem by a constriction. The wall 

 of the pneumatocyst shines through, hypocystic villi could not be discovered quite distinctly. 

 The i)neumatophore has no pigmentation at its top. Immediately beneath the pneumatophore 

 the siphons begin to develop; they have the same shape as the young ones in Cat. 5 A. but 

 of course much smaller. Magnifying with a lens the ptera are already visible. Again an incision 

 is seen on the stem, occasioned by a sudden turn of the stem; the appendages appear on the 

 right side, very closely packed together. These appendages are all situated at the same side 

 along a distance of 20 mm. (6 mm. beneath the pneumatophore). The stem along this part has 

 a breadth of 2,5 mm. The siphons arc without pedicle and the oldest attains already a length 

 of 6 mm. and a stage of development more or less equal to the three young siphons which 

 in 5 A. were situated 28 mm. behind the last young bud of a siphon. 



