218 lniOF. W. A. HASWELL 



for sending me at my request a copy of his paper, " La gestazione esterna, 

 which was otherwise inaccessible to me. For assistance in collecting- 

 specimens I owe thanks to Professor S. J. Johnston, Mr. Thomas Whitrlegge, 

 and Miss B. M. Somerville. 



Systematic. 



The only published work in which there is any reference to the Exogonece 

 of the Australian coasts is Augener's ' PolycliEeta' of the ' Fauna Sudwest 

 Australiens.' In this the following are described : — 



Exogone heteroehceta, Mclnt. 



SpJuerosyllis hirsuta, Ehl. 



Spkcerosyllis perspicax, Ehl. 



Gruhea kerguelensis* Mclnt. 



Gruhea quadrioculata, n. sp. 



Gruhea furcelligera, n. sp. 



Exogone eustifeea, n. sp. (Plate 17. figs. 1-6.) 



This is a larger form than the European E. gemmifera, reaching a length 

 of 7 mm. as compared with the 3 to 4 mm. of the latter. The maximum 

 number of segments observed to occur was 43 as against 33 in E. gemmifera ; 

 but one complete specimen had only 32. 



The palpi are completely united, but separated ventrally by a median cleft. 

 The almost completely semicircular outline of the united palpi maybe broken 

 by a slight median notch, but this is frequently indistinguishable. The 

 prostomium and peristomium are very closely united together and scarcely 

 distinguishable superficially. The three prostomial tentacles are nearly equal 

 in length, the median one slightly longer than the other two, projecting 

 slightly beyond the end of the palpi. They are very slender except towards 

 the end, where there is a marked dilation. The eyes, as is usual in the 

 genus, vary greatly in size in different phases. 



The peristomium bears a pair of extremely rudimentary button-like 

 tentacles, which are placed comparatively far forwards, so that in fixed 

 specimens they may be on a level with the interval between the anterior 

 and posterior eyes. Close to each is a ciliated pit. 



The parapodia (PI. 17. fig. 2) are short— in length less than half the breadth 

 of the body, narrowed distally, the extremity simple, rounded. In each are 

 normally a single stout aciculum and five setae, of which the most dorsally 

 and the most ventrally situated are simple, the rest compound. The dorsal 

 simple seta (figs. 4, 5) ends in a curved conical extremity which may be 

 obscurely notched close to the apex, the notch sometimes, though rarely, 

 bearing a fine hair-like appendage. Often this seta is absent in some of the 

 parapodia or does not project on the surface. The ventral (fig. 6) is more 

 strongly hooked, and is bifid at its apex. The three compound setas (fig. 3) 

 have the terminal appendages greatly reduced, in the form of simple slender 



