BY W. A. HASWELL. 109 



longer, cousiderably longer than the breadth of the segment, the ventral composed 

 of only two or three joints. The anal cirri are similar to the dorsal. 



The oral end of the pharynx i^ provided with a circlet of six well-separateil 

 teeth (figs. 9 and 10), each of which is divided into five sharp cusps, the central 

 one larger than the othex-s. 



The Port Jackson Amblyosyllis is very nearly related to that found at Dinar<l 

 by St.-Joseph and regarded by him as being identical with Gattiola spectabili^: 

 of Johnston (29), Pterosyllis plectorhyncha of Marenzeller (42), and 

 P. madeirensis of Langerhans (36) . The apparent greater lateral ex- 

 tension of the palpi in the Australian form, together with the varia- 

 bility in the length of the nuchal wings and the presence of the ventral 

 eye-spots, are probably not of crucial importance, while the correspondence of the 

 setae and acicula and the peculiar glands in the tentacles and cirri, with the 

 threads which they discharge, correspond closely with St.-Joseph's descriptions. 

 The only discrepancy that appears to be of importance is with regard to the teeth. 

 Marenzeller's figure [(42), Taf. v., fig. 3D] of the teeth of his Pterosyllis plector- 

 hyncha is much nearer what is to be seen in the Port Jackson specimens than St. 

 Joseph's description and figures [(48), p. 65, PI. 9, fig. 66]. In spite of these 

 apparent differences it appears probable that the European and Australian forms 

 will prove to be identical. 



Augener (1) found only fragments of an Amblyosyllis in the Hamburg Ex- 

 pedition's eolleetiou. These he considered to agree well with Ehlers's A. granosa 

 from Magellan (7). 



Family AUTOLYTIDAE. 

 Genus Autolytus. 



AUTOLVTUS PACHYCERUS Aug. 



Autolytus paehycerus, Augener, (1), p. 257, fig. 11 and 12; Text-fig. 40. 



The Port Jackson species of Autolytus which I refer to the above species is 

 characterised by its extremely brilliant colouration, but alcohol-jireserved speci- 

 mens after a time, comjiletely lose all ti'ace of this, and Augener's statement "Die 

 Farbung ist eintonig gelblich weiss ohne besondere zeichnung" becomes applicable 

 to themi 



The most striking superficial feature of thee living worm is the presence in 

 the middle of the dorsal surface of each segment of a bright blue or purple spot, 

 usually rounded, but sometimes produced into a transverse streak. This occurs 

 both in the stock and in the stolons at all stages. The ground colour is red or 

 orange . 



The stock is about 5 mm. iu length and contains about 50 segments. The 

 proventrieulus lies in the 7th and 8th, or 8th and 9th segments; in one specimen 

 it was more elongated, extending from the 8th to the 12th. The first stolon is 

 produced by sehi^ogamy. Later a chain results from gemmation. The separated 

 off female stolons containing each about 30 segments at first swim about actively 

 and are provided with capillary swimming setae on all the segments except the 

 first seven or eight. Aftei-wards the capillary setae become lost, and a little 

 before or shortly after this takes place the ova are discharged, to be subsequently 

 carried about enclosed in a capsule on the ventral surface of the parent. 



A male stolon has about the same number of segments as the female and ha:; 

 capillary setae on all the segments except the first three. 



In all stages the first pair of dorsal cirri are much longer than any of the 

 rest except the second which approaches it in length. 



