14 



alienis modo ex parte adhserente ubique particulis alienis vel quisquiliis dense obducta, cel- 

 lulis vero nudis in tota longitudine liberis perpendiculariter ascendentibus, vario modo flexu- 

 osis, valde elongatis (15ies iGics circiter longioribus quam latioribus) stirpe vix angustioribus. 

 Habitat ad insulas Lofotenses in profunditate 100300 orgyarum fundo limoso, non 

 infrequens. 



Development. 



I have unfortunately not been able to make any observations 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 succeeded in discovering in the creeping stem a couple of polypides 

 in course of formation. Allman has however been more successful, and has even found in 

 the specimen of the Rh. normanni examined by him, a whole series of developments, which 

 is of great interest. I can therefore only add very little to Allman's communications on this 

 subject. Both of the buds observed by me (fig. 20 x.y.) had their place in separate, every- 

 where closed chambers of the creeping stem, without these chambers having as yet prolonged 

 themselves 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. 20 x. fig. 21) corresponds approximately with the youngest 

 stadium observed by Allman; as only 2 parts were to be distinguished, a short stalk and an 

 enlarged terminal part, which had not however the form indicated by Allman of 2 compressed 

 valvules, but of a wide scutiform slightly curved plate (see fig. 21). 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 represents the 

 groundwork of the Polypide's real body, whence as well the tentacular arms as the digestive 

 system are afterwards developed. The other bud (fig. 20 y. fig. 22, 23 & 24) will about an- 

 swer 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 2 tentacular processes (d. d.) extending beyond 

 the border of the shield, and slightly crenulated at the edges, representing the tentacular 

 arms; the stalk (h), which represents the contractile cord, has lengthened itself considerably 

 (see fig. 23.), and its anterior part (fig. 24. h) forms a strong enlargement, marked with evi- 

 dent traces of the spots of dark violet coloring-matter peculiar to the adult animal. The 

 real body was, as stated, still very slightly developed, and appeared only as a small rounded 

 part projecting dorsally between that enlarged part of the stalk and the basis of the tenta- 

 cular arms; on the ventral side, or that which turned towards the concave surface of the 

 scutiform plate, it was in the middle, and to a small extent, united to the same by growth; 



