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SIDNEY P. HARMER. 
istic form represented in fig. 2. The foot-gland is well 
developed, the termination of the foot is alate, and there is no 
definite arrangement of the ectoderm cells of the stalk. At 
each side of the calyx occurs a series of gland-cells (fig. 2 ,gc.). 
The larva differs considerably in structure from any other 
Loxosoma larva at present described. Perhaps the most 
characteristic feature of the adult is the presence of a group of 
remarkable cells (fig. 5, ac .) at the apex of the vestibule. The 
stomach is divided into a median and two lateral portions, as 
represented in the figure. 
Explanation of the terms Dorsal, Ventral, &c., as applied to 
descriptions of Loxosoma. 
It will be convenient to define at once the use of such terms 
as “ dorsal ” and “ ventral,” “ transverse,” and so on. From 
reasons which will appear in the sequel, I am led to support 
the view that the ventral line of the body is that between 
mouth and anus, in opposition to Caldwell’s theory (34) that 
this surface is dorsal in the Polyzoa. 
The dorsal region is drawn out into the stalk on which the 
calyx or body of the animal is borne, whilst the anus is of 
course posterior to the mouth. 
A transverse section is one which passes in the plane of 
the stalk through the right and left sides, and therefore 
parallel to the flat surfaces of the somewhat discoidal calyx, 
whilst a horizontal plane is at right angles to the long axis. 
Part 2. — Anatomy of the Adult Loxosoma. 
The entire animal consists of two parts, the calyx or body, 
and the stalk by which it is attached to its resting place. The 
two budding regions are situated at about the middle of the 
calyx, right and left ; owing to the fact that the buds become 
free as soon as they reach maturity, Loxosoma, unlike 
almost all other Polyzoa, never forms colonies. 
The ventral side of the body is produced into a free fold 
enclosing the vestibule on the oral face of the animal. The 
