Miscellanea us . 1 69 



plate at the summit, which, however, contains an orifice of con- 

 siderable size, concealed by overlying spines. This orifice does not 

 lead into the cavity occupying the whole inner space of the test, 

 but into a peculiar sac spread out beneath the dorsal arch, which 

 does not seem to communicate with the general cavity, and in which 

 the above-mentioned little sea-urchins lie; so that they can make 

 tlieir escape through the opening, which corresponds with them in 

 diameter. The walls of this sac are formed by a membrane filled 

 with a microscopic calcareous latticework ; this is applied to the 

 margins of the orifice, which are broadly turned inwards, and is thus 

 suspended. Upon the inner surface of the sac small Fedicellarice 

 are seated, and upon the inner surface of the above-mentioned in- 

 curved margins small spines ; upon the surface of the test, besides 

 the spines, Fedicellarice of larger dimensions occur ; and the spines 

 (which, however, do not appear to the eye to form rows) are of two 

 kinds — namely, longer ones, which are not very sharp, and shorter 

 ones spreading at the end into small teeth. 



The internal space of the test, situated beneatli the sac destined 

 for the reception of the young, is chiefly occupied by the intestinal 

 canal, which is attached to the wall, and commences with a very 

 narrow oesophagus : on the anterior part of the wide portion, in 

 which this is immersed, and which perhaps may be indicated as a 

 stomach, a spot beset with minute paired caeca may be observed. A 

 very fine and rather rigid canal, descending from the bottom of the 

 brood-sac and probably continued to the region of the peristome, 

 may perhaps be the sand-canal, and the spot from w^hich it origi- 

 nates the madrepore-plate. But no trace of genitalia is to be seen, 

 which is in accordance with the want of genital apertures. The 

 germs of the young must be produced on the lower surface of the 

 brood-sac; for here are suspended oval corpuscles about | millim. 

 in length, closely embraced by a saccule, w^hich greatly resemble the 

 youngest spineless embryos in the brood-cavity, whilst the most de- 

 veloped of the latter, as already stated, possess a test with feet and 

 spines, and even with Pedicellarice. Nevertheless these young ani- 

 mals do not present any complete agreement with the parent animal; 

 their test is circular in its horizontal circumference, the peristome 

 central, the larger spines distinctly stand in two longitudinal rows 

 upon the interambulacra, and, above all, they want the apical orifice 

 and the pit for the anus, although a spot free from spines may be 

 observed upon the back of the test a little behind the middle. 



According to this representation (which, indeed, is founded only 

 upon the investigation of a single specimen) these germs, which are 

 seated upon the calciferous walls of a sac opening outwards with a 

 wide orifice, would have to be regarded as buds, and Anochanus as a 

 young or larval state, like a Pluteus ; but the young which it pro- 

 duces must await a sexual development. 



However, it is permissible, and will facilitate future comparisons, 

 to give the animal on which these investigations have been made a 

 distinct name; and as, according to the statement of Salmin, th*' 

 natural-history dealer, it was found in 'the Chinese .Sea, it may be 



Ann. (^ Mag. N. Hist. Ser.4. Voli\. 12 



