7-4 RKCOi;i)S OK TIIK AUSTRALIAN MTSETM, 



B(»NKM,IA HA.-\VKl,l.l ii . sp. 



Tlie following description is based on an examination of the preserved 

 specimens, one collected by Wliitelegge^ and the other by Professor 

 Haswell". They were preserved in alcohol, and were, of course, 

 decolourised. The coloni' of the living woinis was stated to be gieen. 



'J'lie animal has a typical JioneUln shape (PI. xv., tig. 1), the sac-like 

 l)ody measni'ing ovei- two inches in length and 8*4 inches in greatt»st 

 breadth ; while the contracted proboscis measures about four inches, and 

 each arm of the bifurcation about H inches. The ventral proboscis- 

 groove is very distinct. 



The skin is marked by transveise ridges consisting of rows of i-ather 

 small papilhv, just visible to the naked eye. This niarking (iccui's 

 uniformly over the whole body, but not on the proboscis. 



Jn section (PI. xvi., Fig. 5), the wall is seen to consist of an outer 

 epidermis, below which is a dermis, succeeded by thi-ee muscle layeis. The 

 epidei'mis consists of a layer of elongated, irregulail}' compressed cells, 

 with darkly staining nuclei, among which lie a few scattered, heavily 

 staining cells, probably of the natui'e of mucin-secreting gland cells. 

 These do not extend into the dermis, as has been described in othei' forms 

 (e.g., FsemlohnitpJIin ; h.paraicea). The ilermis is strongly developed, 

 especially below the papilla^, the whole of the internal mass of the latter 

 being composed of it, mo part of the muscle layers entei'ing into its 

 formation. The dermis may be divided into two very distinct parts, an 

 outer somewhat hyaline, and an inner tibrtms poi-tion. The outer layer 

 consists of a ma.ss of loose connective tissue which is Avell developed at 

 the si»les of the papillje and also between them, though it may here be 

 displaced by the fibrous layer. 'J'he dor.sal pai't and the " (roic " of the 

 papilla, however, consist of the tibious layei". The tibivs have a lonsritu- 

 dinal dire(;tion ; above, they form a dense layer beneath the papillary 

 epidei'mis, and communicate below with the innei- muscle layer, serving 

 ])ossibly as retrac^tors of the papilla* and thereby assisting in locomotion. 

 The longitudinal muscle layer is not bi-oken up into distinct bands. 



Thei-e ai-e two seta^, measuiing at least 11 n)ni. in length. 



The alimentaiy canal is typical of J-tivicllid, but is somewhat nioi-e 

 strongly coiled. The pharynx is wide, the (vsophagus nan-ow and thick- 

 walled, while the intestine is wide and very thin walled, narrowing off 

 towards the anus. Numerous sti'ong mesenteric st.i-ands pass fi'om the 

 body wall to the intestine. In this species a definite siphon is piesent. 

 It originates as a very narrow tube on the dorsal surface of the pliai'vnx 

 and widens somewhat posteriorly. Jt has no posterioi- communication 

 with the intestine, but ends blindly in a curious lobulated structure. 

 Possibly this is the degenerated lenniins of a omplex funnel similar to 



Whhi'h'if-^i'-lhid. 

 ' Hasw.'ll— I'loc. liinn. Sue, N.S.Wjilt^s, x.. Iss.".. ]^^. Xi\- 



