244 Transactions. — Zoology. 



subequal, the four last being furnished with a number of blunt spines ; the 

 geniculate appearance of these limbs is chiefly due to the fact of the 6th 

 joint being articulated to the middle of the 5th and at right angles to it. 



The ovigerous legs are 10-jointed and smooth ; the three last joints 

 become progressively smaller, the last being a minute tubercle ; these 

 organs show no trace of denticulated spines. 



The legs are about 10 mm. long, and are tolerably stout. The joints 

 are considerably geniculated, so that the limbs cannot easily be extended on 

 a flat surface ; their lengths (in the 3rd pair) are as follows : — 

 1, 2, 3, 4, 5, 6, . 

 3. 5. 4. 12. 12. 13. ' 

 the extremities of the joints are all more or less furnished with the charac- 

 teristic blunt spines, particularly at their apices. The 1st tarsal joint is 

 very short, while the 2nd is rather longer than the 2nd joint of the leg, and 

 has a double row of spines along the inner margin ; the claw is about half 

 as long, and is supplemented by two auxiliary claws. 



Hab. In rock-pools at Oamaru and near Dunedin, and in Otago 

 Harbour. 



4. Ammothea magniceps, n. sp. PI. xv., figs. 1-5 ; and pi. xvi., fig. 3. 



Body moderately robust, distinctly articulated, and with the lateral 

 processes close to but quite separate from one another ; total length 7 mm. 

 The rostrum is very large and stout, more than three-fourths as long as 

 the body, very broadly cylindrical or almost barrel-shaped in the anterior 

 portion, with the inferior part chiefly dilated ; directed slightly downwards. 



The abdomen is about 1 mm. long, slender and cylindrical, and directed 

 obliquely upwards. 



The oculiferous tubercle is situated about the middle of the cephalo- 

 thoracic segment; it is stout, bluntly rounded at the end, but with a 

 posterior notch when seen from the side. 



The mandibles are in a very rudimentary condition, their 2nd joint 

 being a rounded tubercle projecting nearly at right angles from the middle 

 of the 1st joint. The palpi are about 4-J mm. long, and are 10-jointed, the 

 2nd and 4th joints being long, and the others very short ; they are all 

 quite destitute of spines. » 



The ovigerous legs are short (only 3 mm. in length), slender and 

 10-jointed ; the four last joints are each furnished near their distal ex- 

 tremity with an oblique row of 4 or 5 denticulate spines. 



The legs of the 3rd pair are 15 mm. long. The following formula 

 represents the relative length of the joints (including the two tarsal 

 joints) : — 



1, 2, 3, 4, 5, 6, 7, 8, 



2. 5. 3. 14. 12. 14. 1. 4. 



