87 



rod a large, upwards directed supplementary transverse rod proceeds; 

 in the specimen they are broken at their base, but it appears that their 

 position must be as shown in the figure 33, crossing one another over the 

 middle of the stomach. The point is widened and has an indication of 

 the same structure as in species c and the species e— f, viz. a simple, outer 

 process and a widened, somewhat serrate inner process. (On account of 

 the crossing of the rods the latter branch here becomes the outer one). 

 By this position of the rods it is hard to see how the adductor muscle 

 could be attached here (perhaps to the outer side of the simple process, 

 not to the inner side as in the other species (?); the muscle cannot 

 be observed in the specimen). Another branch of the ventral recurrent 

 rod goes downwards, where it meets (and joins?) the end of the body 

 rod. The anterolateral rods are well developed, slender, with few small 

 thorns. Just outside their base a long simple thorn proceeds from the 

 postoral rod. The recurrent rod is fairly long, smooth, bifurcating at the 

 end. The posterior transverse rod is simple, bowshaped, with a small 

 prominence in the middle of the posterior edge, otherwise smooth; the 

 ends are not widened. Posterodorsal rods have not been formed, but there 

 is a well developed, quite normally shaped dorsal arch; its branches are 

 simple and smooth; there is a small median backward prominence, as 

 usually found in the dorsal arch. 



Species e. This is the species which was described in the paper quoted 

 above. Several specimens were taken by Mr. Blegvad off the South 

 Coast of Haiti and off the West Coast of Portorico in the end of January 

 and the beginning of February 1911. Furthermore some specimens were 

 found in plankton samples. taken by Mr. P. Kramp off Madeira (32° 10' N. 

 17°20' W. ; 30/X. 1911) and off the Canaries (27°10' N. 21°53' W. ; 3/XI. 1911) 

 and in the same neighbourhood (34°22' N., 14°57' W., and 28°43' N. 

 20°40' W.) by Mr. H. Fogh in October 1912 (on the 16th and 22nd). 

 A pair of specimens were also taken by Mr. H. Faye in the harbour of 

 Christiansted, St. Cruz, on the 9th and 16th of June 1915. The larva is 

 thus seen to occur nearly all the year round. 



Referring to the paper quoted I may give here only a pair of textfigures 

 (Fig. 29 on p. 78) in order to show the general appearance of this extra- 

 ordinary larva, which, with its extremely long horizontally directed, 

 slightly downwards curved postoral arms, in fact reminds one of a rope- 

 dancer with an immense balancer. In the specimen with the arms best 

 preserved they are 12 mm long, no less than 24 times the body length, 

 and still the point is broken off. The body has the shape of a truncated 

 four-sided pyramid. The postoral arms alone are developed; a pair of 



