RHADDOPLEURA MIRABILIS. 39 



haerente ubique particulis alienis vel quisquiliis dense obducta, 

 cellulis vero iiudis iu tota longitudiiie liberis perpendicu- 

 lariter ascendeutibus, vario modo flexuosis^ valde elongatis 

 (-J5ic3 — 2(]ies circiter longioribus quam latioribus) stirpe vix 

 angustioribus. 



Habitat ad insulas Lofotenses in profunditate 100^ — 300 

 orgyarum fundo limoso, non infrequens. 



I have unfortunately not been able to make any observa- 

 tions on the development of the living animal, in which I 

 have also in vain sought for the organs of generation. It was 

 only by critically passing in review the specimens, which I 

 had brought home one by one, that my father at last suc- 

 ceeded in discovering in the creeping stem a couple of poly- 

 pidcs in course of formation. AUman has, however, been 

 more successful, and has even found in the specimen of the 

 RJt. Normanni examined by him, a whole series of develop- 

 ments, Avhicii is of great interest. I can, therefore, only 

 add very little to Allman's communications on this subject. 

 Eoth of the buds observed by me had their place in 

 separate everywhere closed chambers of the creeping stem, 

 without these chambers having as yet prolonged them- 

 selves into any cell, and, like the developed polypides, 

 appeared here attached to the axial cord near the bottom of 

 the chambers, at a short distance from the transversal 

 septum. The youngest of the buds (fig. 7) corresponds 

 ai)proximately with the youngest stadium observed by 

 Allman, as only two parts were to be distinguished, a short 

 stalk and an enlarged terminal part, which had not however, 

 the form indicated by Allman, of two compressed valvules, 

 but of a wide, scutiform, slightly curved plate (see fig. 7). 

 The stalk (h), which is strongly, almost globularly enlarged, 

 is continued for some distance along the concave side of the 

 scutiform plate mentioned ; but this continuation, which is 

 not visible from one (the ventral) side, is by an evident 

 instriction separated from the proper stalk, and repre- 

 sents the groundwork of the polypide's real body, wdience 

 as well the tentacular arms as the digestive system are after- 

 wards developed. The other bud (figs. 7, 8, and 9) will 

 about answer to the stadium delineated by Allman, 1. c, 

 fig. 6. The peculiar scutiform part (c) has also here the 

 form of a wide, evenly curved plate, which already has 

 assumed a somewhat pentagonal form, and completely covers 

 on one side the still only slightly developed real body, from 

 which, however, there project in front, two tentacular pro- 

 cesses (d, d), extending beyond the border of the shield, and 



