230 MYRIANIDA PINNIGERA. 



August, 1872, amongst the roots of tangles (nurse-stock with female buds). Amongst 

 ascidians and sponges, Plymouth (Allen). 



Shores of France (Audouin and Edwards). Madeira (Langerhans) . 



Head comparatively small, bluntly conical or irregularly rounded, the transverse 

 exceeding the antero-posterior diameter in spirit-preparations, whilst the posterior border 

 is rounded and the anterior truncate. The eyes are large, the two anterior being the 

 wider apart and with lenses, though the pairs on each side are close together. The palpi 

 appear to be fused, forming two rounded bosses with a median furrow in front. The 

 median tentacle is long and somewhat clavate, the lateral on each side shorter, more 

 cylindrical, and somewhat dilated at the tip. A short, curved pair of tentacular cirri 

 follow, then another clavate pair, rather longer than the first. All have vibratile cilia. 

 De St. Joseph describes the median and lateral tentacles in his M. maculata as foliaceous 

 like the cirri in the nurse-stock of sixty segments. There would thus seem to be variation 

 in this respect. 



Body (in nurse-stock and buds from Bressay Sound) about 1^- in. long, 1 the two 

 sections being about equal in length. The dull whitish nurse-stock in front is brilliantly 

 marked by thirteen rich orange spots, two irregular patches in front, the first commencing 

 behind the eyes, and median in position, with the posterior end somewhat bifid, and the 

 second occasionally is also chiefly longitudinal, followed by a pair (the third), and then 

 by nine well-defined spots having a deep orange marginal belt and a paler orange centre. 

 Two orange dots occur on the last segment of the nurse-stock. The posterior region or 

 section is formed of buds, the largest (and oldest) being posterior. Eight or nine had 

 distinct eyes, in the rest these were obscure. 



Behind the long clavate cirrus mentioned in connection with the head are two or 

 three shorter cirri of similar form, the last, however, having a tendency to flattening. 

 All the foregoing cirri and tentacles are more or less ringed in spirit, thus being at once 

 differentiated from the succeeding cirri, which assume the form of flattened oars, and 

 continue of this shape to the posterior end. In those in process of regeneration the 

 organs are narrower and more pointed. The cirri throughout are translucent, with a 

 faint, milky opacity. The buds have minute cirri of the same form as the nurse-stock. 

 The terminal (and oldest) bud had two longer caudal cirri. On the dorsum of the buds 

 the orange specks are chiefly arranged in pairs. 



Claparede (1868) describes the proboscis as similar to that in Procerdea aurantiaca, 

 the anterior edge without papillae or denticles, and the proventriculus with about thirty- 

 four rows of points. 



De St. Joseph describes the nurse-stock as having in his example sixty-six segments. 

 Then followed a bud of ten segments, and behind it fifteen others. The first had a 

 rudiment of a head without eyes, with two rudimentary palps. It had three segments. 

 The second and third were similar, but with four segments. The fourth agreed with the 

 foregoing, but had eight segments. The fifth had four minute eyes and twelve segments, 

 and a simple pigment-touch. The sixth and seventh were similar, and the palps were 



1 Malaquin gives 32 mm. for nurse-stock and 38 mm. for stolons in one, sixty-six segments 

 (twenty-nine stolons) . 



