3t3 CARL VOGT. 



c. In harmony with their solitary condition, the Loxosomas 

 are often furnished with a pedal gland, which is universally pre- 

 sent in the young state ; whilst the Pedicellince, rooted by means 

 of a stolon, are destitute of it. 



d. Loxosoma only produces a small number of ova, and has 

 no true brood- chamber like Pedicellina. 



Our Author accepts these propositions with some slight quali- 

 fication. He has never seen Pedicellina more crowded with 

 ova than Loxosoma, in which he has counted as many as thirty in 

 all stages of development, while as to the brood-chamber, it has 

 its analogue in the clustered ovisacs, which have been previously 

 described. Besides the distinctions noted by Nitsche, an im- 

 portant difference between Pedicellina and Loxosoma is to be 

 found in the position of the tentacular crown and the general 

 conformation of the body. The former is placed on the ventral 

 side in Loxosoma, while it occupies the extremity of the axis of 

 stem and body in the Pedicellina. The body of the latter is 

 laterally compressed, that of the former vertically. The tenta- 

 cular apparatus is situated exactly on the summit in the Pedi-- 

 cellinm, on the slightly concave ventral side in Loxosoma ; that 

 part of it which in the former presents the appearance of a sac 

 with a central orifice, in the latter assumes the form of a hood, 

 fastened under the chin and drawn over the head. A tendency, 

 however, towards a similar conformation is recognisable in the 

 Pedicellina, whose two sides, the ventral and dorsal, are far from 

 symmetrical. This unsymmetrical habit is already visible in the 

 bud ; it enters into the primitive plan of the PedicellincB, but 

 in them it is obscurely indicated, whilst in Loxosoma it exists to 

 such an extent as to involve the displacement of the tentacular 

 corona. 



The Loxosomas are further distinguished by a certain delicacy 

 in the entire constitution both of the organs and tissues. i The 



which 1 am iudebted to Dr. M'Intosh, the liae of separation between the 

 body and the stem is very strongly marked, and there is a slight indentation 

 where they join. In another species from the Gulf of St. Lawrence, the 

 body seems to pass as it were into the stem, without any apparent line of 

 demarcation between them. In no case, it would seem, is the separation 

 between body and peduncle so complete as in Pedicellina, in which genus 

 the fall and subsequent renewal of the body are of frequent occurrence. — 

 Tratisl. 



' This may, perhaps, prove to be a somewhat hasty generalisation. At 

 any rate, I can adduce one very notable exception. A species of Loxosoma 

 occurs on the scales of Lagisca from the Gulf of St. Lawrence, which is 

 remarkable for the stoutness of its habit, and for the thickness and tough- 

 ness of the body-wall, which is more or less covered, like the stem of Pedi- 

 cellina echinata, with spinous processes. I owe to Dr. M'lutosh's kindness 

 the opportunity of examiuing this very interesting form, which I hope 

 shortly to describe in detail. — Transl. 



