]G0 Prof. M'Tiitosli's Notes fi'om the 



their gradual increase in length from before backward 

 corroborates this view. In some, when seen antero-poste- 

 liorh", the tips are spatula-shaped, a slight constriction 

 occurring at the neck. One or two capillary bristles, with a 

 slight flattening of the tapered and serrated tip, accompany 

 the dorsal hooks. Several procured at Guernsey and Herra 

 in July and August had well-developed eggs. Moreover, an 

 cpitokous male more than 2 inches long occurred amongst 

 the others. In this the anterior region of about twenty-two 

 segments (exclusive of the head and six or seven segments) is 

 modified, whilst the caudal of about thirty segments is not 

 materially changed. The pigmented area of the eyes is 

 perhaps a little larger, and the dorsal tuberosity of the head 

 somewhat more prominent, whilst the tentacles and branchiae 

 are normal. The whole of the anterior and middle regions 

 are enlarged and softer, and have long resplendent dorsal 

 swimming-bristles which in length exceed the diameter of 

 the body. They are smooth^ simple, tapering bristles with 

 very faint longitudinal lines, and of a pale yellow hue, best 

 seen by transmitted light, and their tips are remarkably 

 attenuate. The anterior dorsal bristles are little altered, but 

 from the eighth to the thirty-first they form conspicuous 

 tufts on each side. This bristled region, with the head, is 

 probably thrown off and discharges the sexual elements, 

 whilst the unchanged and flattened moiety of about thirty 

 segments reproduces a head and anterior region. The fact 

 that this example, which was not quite ripe, still occupied its 

 tube in Lithothamnion would indicate that up to the period 

 of "^ swarming ^^ the oar-shaped posterior region and its 

 series of powerful hooks would be of material service to the 

 form, and, further, after the separation of the sexual region, 

 if such is found to occur, the remnant would be ready for 

 the emergencies of its life in the calcareous crusts and 

 masses. The great size of the hooks or crotchets throughout, 

 and especially in the posterior region, shows that the form is 

 adult and that the shovel-shaped and abraded posterior hooks 

 Lave been in constant use. In the dorsal division one or 

 two of the tapering capillary bristles with the anterior edge 

 of the tip serrated are present. 



The great size of the hooks in Dodecaceria ater and their 

 special structure at once attract attention, especially when 

 contrasted with those of D. concharum. 



A form (^Cliatozone dunmanni), which appears to be inter- 

 mediate between Cirraiulus and Chatosone, comes from 



