81 



M. tridentata belongs to Alcock's sub-genus Galathodes, and 

 M. curvirostra to Munidopsls proper. 



Mundiopsis (Galathodes) tridentata (Esmark.) 



PL XII, figs. 1-5. 



Galathea tridentata, Esmark, 1856. 

 Galathodes rosaceus, A. Milne-Edwards, 1881. 

 Galathodes tridentata, G. O. Sars, 1882. 

 Munidopsis rosacea, Alcock and Anderson, 1899. 

 Galathodes tridentata, A. Milne-Edwards and Bouvier, 1899. 

 Munidopsis tridentata, Alcock, 1901. 

 Galathodes tridentata, Appellof, 1906. 



The carapace, excluding the broad, flattened rostrum, is 

 roughly quadrilateral. The two lateral margins are very 

 slightly convex, and each bears four small teeth. The posterior 

 tooth is situated immediately behind the cervical groove, and 

 the anterior and largest one forms the antero-lateral angle of 

 the carapace. The rostrum is less than half the length of the 

 carapace, and is slightly but distinctly carinated in the median 

 line, ending in a trifid tip, the central point of which is the 

 longest. Between the base of the rostrum and the antero-lateral 

 spine there is a sharp tooth above the base of the antenna. The 

 hind margin of the carapace is smooth and very slightly concave. 

 The whole dorsal surface is rugose and covered with short hairs. 

 The cervical groove is most distinct at the sides and is more 

 vague in outline in the middle. On the central part of the cardiac 

 region there is a short transverse furrow which extends about 

 half way to either lateral margin and has at each end a circular 

 depression. There is another .depression just in front of the 

 hind margin. The linea anomurica is distinct. The sub-lateral 

 surface of the carapace is rugose like the dorsal part. 



The abdomen, when straightened out, is of about the same 

 length as the carapace, excluding the rostrum. None of the 

 terga bear spines. The covering of setae is not so dense as on 

 the carapace. 



The second and third abdominal segments have a dorsal 

 transverse groove which is wanting on the other segments. The 

 pleura of the second segment are broader than the others. The 

 basal part of the telson is bounded by a straight line in front 

 and rounded behind. It is followed by a very small triangular 

 plate. The hind part of the telson is divided by a deep median 

 and two oblique lateral grooves. 



The eyes are not facetted and are devoid of pigment. They 

 are terminal on the sub -cylindrical eyestalks. Immediately to 

 the exterior of each stalk there is a small sharp tooth. 



The antennules are short, reaching only slightly beyond the 

 tip of the rostrum when extended. The basal joint is massive 



6 



