BY WILLIAM A. IIASWELL, M.A., B. SC. 45 



tridentato ; sinu tlioracico nullo ; sterno in utroque sexu antice 

 granulato." 



Hal. Coasts of Australia (Brit. Mus.). 



Sp. 3. Leucosia ocellata, Bell. (I. c, p. 289, pi. 31. fig. 1). 

 " Testa rliomboidali ; fronte tridentato ; regione gastrica maculis 

 quatuor parvis riibris signata, qiiarum binre anterior esocellatse." 



Hal. Eastern Shores of Australia, (Brit. Mus.) ; Keppel Bay, 

 (Chevert Exped.). 



Sp. 4. Leucosia Wliitei, Bell. (I.e., p. 289, pi. 31. fig. 2). "Testa 

 rhomboidea, fronte producto, minute tridentato ; regionibus 

 hepatica et brancliiali granulis tribus vel quatuor ; bracliiis 

 tomentosis, tuberculis magnis oninino instructis." 



When Bell wrote his monograph, he had only seen a single 

 specimen of this species (a female), found by Macgillivray on the 

 eastern coast of Australia. The Chevert Expedition obtained 

 specimens from Princess Charlotte Bay, Cape Grenville and Brook 

 Island. The male abdomem has its compound part, which 

 includes all the joints except the first and seventh, divided into 

 two segments, of which the proximal is rather broad and prominent, 

 and is marked posteriorly hy a short mesial sulcus, while the 

 distal is broad at the base, decreasing gradually in breadth 

 towards its rounded distal extremity. 



Sp. 5. Leucosia reticulata, Miers, f Trans. Linn. Soc, 1877, p. 

 237, pi. 38, figs. 13 — 15). Testa orbiculari, laevi, lineis viridibus 

 reticulatis ornata ; fronte brevissimo, integro ; sinu thoracico 

 brevi, haud definito ; regione hepatica granulis panels riibris 

 signata. 



Sab. Shark's Bay, Western Australia. (Brit. Mus.). 



A specimen from Port Darwin in the Chevert collection is 

 probably referable to this species ; it agrees very closely with 

 the description and figures in the form of the carapace and of the 

 thoracic sinus, the disposition of the tubercles on the arms, etc.; 



